Advanced

Tutor model

i62 💰:9.4

i52 💰:7.9

🏆 i67 💰:62.5

i70 💰:125.0

i68 💰:125.0

🏆 i66 💰:75.0

i65 💰:125.0

i63 💰:62.5

i61 💰:75.0

i60 💰:9.4

i60 💰:37.5

i58 💰:62.5

i57 💰:22.5

i57 💰:37.5

i56 💰:45.0

⚡ i55 💰:11.25

i55 💰:37.5

i54 💰:62.5

i52 💰:35.0

i51 💰:37.5

i49 💰:15.0

i49 💰:62.5

i48 💰:11.3

i47 💰:7.5

i44 💰:25.0

i43 💰:37.5

i42 💰:187.5

i40 💰:5.0

i39 💰:100.0

i38 💰:37.5

i37 💰:11.0

i36 💰:187.5

i34 💰:12.5

i33 💰:37.5

i30 💰:1.0

i29 💰:1.5

i28 💰:150.0

i23 💰:20.0

i20 💰:4.0

i18 💰:1.0

i16 💰:25.0

i13 💰:1.5

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What would you like to learn?

Override for the tutor's lesson content generation calls. Auto uses the system default (Claude Sonnet 5 for lesson text, Opus 5 for diagrams).

Lesson generation model

System default

i58 💰:18.8

i31 💰:11.0

i25 💰:31.3

Tutoring abilities

Imagine reading a science report that says: *"Tigers are big cats. They have teeth and they like meat."*

That feels plain and boring because it doesn't give us any exact numbers, clear pictures, or real proof.

How do we turn plain sentences into exciting, trustworthy writing?

A **fact** is a piece of information that can be proven true by checking a reliable source.

A **concrete detail** is a specific description—like an exact measurement, name, or number—that helps the reader picture real reality.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }
    .topic-selector {
      display: flex;
      gap: 8px;
      margin-bottom: 12px;
    }
    .topic-btn {
      background: #ffffff;
      border: 1px solid #e6e6e6;
      border-radius: 20px;
      padding: 6px 14px;
      font-size: 14px;
      font-weight: 600;
      color: #6b7280;
      cursor: pointer;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
      transition: all 0.2s ease;
    }
    .topic-btn.active {
      background: #1e2945;
      border-color: #1e2945;
      color: #ffffff;
    }
    .compare-container {
      width: 100%;
      max-width: 480px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }
    .view-card {
      background: #ffffff;
      border-radius: 12px;
      border: 2px solid #e6e6e6;
      padding: 14px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      transition: border-color 0.2s ease;
    }
    .view-card.concrete {
      border-color: #22b7ff;
      background: #f0f9ff;
    }
    .card-title {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 10px;
    }
    .vague .card-title {
      color: #9ca3af;
    }
    .concrete .card-title {
      color: #0284c7;
    }
    .visual-stage {
      height: 90px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      margin-bottom: 10px;
    }
    .vague-icon {
      font-size: 52px;
      filter: blur(4px) grayscale(80%);
      opacity: 0.5;
      user-select: none;
    }
    .concrete-icon {
      font-size: 58px;
      user-select: none;
      filter: drop-shadow(0 4px 6px rgba(34,183,255,0.25));
    }
    .chip-stack {
      display: flex;
      flex-direction: column;
      gap: 6px;
      width: 100%;
    }
    .chip {
      font-size: 13px;
      font-weight: 600;
      padding: 6px 8px;
      border-radius: 8px;
      line-height: 1.2;
    }
    .chip-vague {
      background: #f3f4f6;
      color: #9ca3af;
      border: 1px dashed #d1d5db;
    }
    .chip-detail {
      background: #ffffff;
      color: #0f172a;
      border: 1px solid #bae6fd;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
    }
    .chip-detail span {
      color: #0284c7;
      font-weight: 700;
    }
  </style>
</head>
<body>

  <div class="topic-selector">
    <button class="topic-btn active" data-topic="0">🐕 Dog</button>
    <button class="topic-btn" data-topic="1">🌲 Tree</button>
    <button class="topic-btn" data-topic="2">🚀 Rocket</button>
  </div>

  <div class="compare-container">
    
    <div class="view-card vague">
      <div class="card-title">☁️ Vague Guess</div>
      <div class="visual-stage">
        <div class="vague-icon" id="vagueIcon">🐕</div>
      </div>
      <div class="chip-stack">
        <div class="chip chip-vague" id="vagueText1">"really big"</div>
        <div class="chip chip-vague" id="vagueText2">"runs fast"</div>
      </div>
    </div>

    
    <div class="view-card concrete">
      <div class="card-title">✦ Concrete Detail</div>
      <div class="visual-stage">
        <div class="concrete-icon" id="concreteIcon">🐕</div>
      </div>
      <div class="chip-stack">
        <div class="chip chip-detail" id="concreteText1">
          <span>Mastiff:</span> 180 lbs
        </div>
        <div class="chip chip-detail" id="concreteText2">
          <span>Speed:</span> 25 mph
        </div>
      </div>
    </div>
  </div>

  <script>
    const topics = [
      {
        icon: '🐕',
        vague: ['"really big"', '"runs fast"'],
        concrete: ['<span>Mastiff:</span> 180 lbs', '<span>Speed:</span> 25 mph']
      },
      {
        icon: '🌲',
        vague: ['"super tall"', '"very old"'],
        concrete: ['<span>Redwood:</span> 380 ft', '<span>Age:</span> 2,000 yrs']
      },
      {
        icon: '🚀',
        vague: ['"flew high"', '"went quick"'],
        concrete: ['<span>Saturn V:</span> 363 ft', '<span>Speed:</span> 24,000 mph']
      }
    ];

    const buttons = document.querySelectorAll('.topic-btn');
    const vagueIcon = document.getElementById('vagueIcon');
    const concreteIcon = document.getElementById('concreteIcon');
    const vagueText1 = document.getElementById('vagueText1');
    const vagueText2 = document.getElementById('vagueText2');
    const concreteText1 = document.getElementById('concreteText1');
    const concreteText2 = document.getElementById('concreteText2');

    function selectTopic(idx) {
      buttons.forEach((btn, i) => {
        btn.classList.toggle('active', i === idx);
      });
      const data = topics[idx];
      vagueIcon.textContent = data.icon;
      concreteIcon.textContent = data.icon;
      vagueText1.textContent = data.vague[0];
      vagueText2.textContent = data.vague[1];
      concreteText1.innerHTML = data.concrete[0];
      concreteText2.innerHTML = data.concrete[1];
    }

    buttons.forEach((btn, idx) => {
      btn.addEventListener('click', () => selectTopic(idx));
    });
  </script>
</body>
</html>

When you write an informative report, your goal is to teach real knowledge, not just share guesses or feelings.

What happens if a fact is true, but does not fit your main point?

A detail is **relevant** when it directly explains or supports your specific main topic.

If a fact wanders away from your focus, it is **irrelevant** and confuses the reader—even if it is interesting!

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Relevant vs Irrelevant Details</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      background: transparent;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 12px;
      gap: 16px;
      user-select: none;
    }

    .topic-badge {
      display: flex;
      align-items: center;
      gap: 8px;
      background: #e0f2fe;
      border: 2px solid #38bdf8;
      border-radius: 999px;
      padding: 8px 18px;
      font-size: 16px;
      font-weight: 700;
      color: #0369a1;
      text-align: center;
    }

    .stage {
      position: relative;
      width: 100%;
      max-width: 420px;
      height: 180px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .card-slot {
      position: absolute;
      width: 220px;
      height: 110px;
      background: #ffffff;
      border: 2px solid #e6e6e6;
      border-radius: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 6px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.06);
      transition: all 0.35s ease;
      opacity: 0;
      transform: scale(0.9) translateY(10px);
      pointer-events: none;
    }

    .card-slot.active {
      opacity: 1;
      transform: scale(1) translateY(0);
      pointer-events: auto;
    }

    .card-slot.relevant {
      border-color: #10b981;
      background: #f0fdf4;
    }

    .card-slot.irrelevant {
      border-color: #ef4444;
      background: #fef2f2;
    }

    .card-icon {
      font-size: 28px;
      line-height: 1;
    }

    .card-label {
      font-size: 15px;
      font-weight: 600;
      color: #1e2945;
    }

    .status-tag {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      padding: 2px 8px;
      border-radius: 999px;
    }

    .status-relevant {
      background: #dcfce7;
      color: #15803d;
    }

    .status-irrelevant {
      background: #fee2e2;
      color: #b91c1c;
    }

    .controls {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .btn-nav {
      background: #ffffff;
      border: 1px solid #d1d5db;
      border-radius: 8px;
      padding: 6px 12px;
      font-size: 14px;
      font-weight: 600;
      color: #374151;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .btn-nav:hover {
      background: #f3f4f6;
    }

    .dots-container {
      display: flex;
      gap: 6px;
      align-items: center;
    }

    .dot-btn {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      border: none;
      background: #cbd5e1;
      cursor: pointer;
      padding: 0;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .dot-btn.active {
      background: #0284c7;
      transform: scale(1.2);
    }
  </style>
</head>
<body>

  <div class="topic-badge">
    🎯 Topic: Penguin Warmth
  </div>

  <div class="stage">
    
    <div class="card-slot relevant active" id="card-0">
      <div class="card-icon">🪶</div>
      <div class="card-label">Thick down feathers</div>
      <div class="status-tag status-relevant">✓ Relevant</div>
    </div>

    
    <div class="card-slot relevant" id="card-1">
      <div class="card-icon">👥</div>
      <div class="card-label">Group huddle</div>
      <div class="status-tag status-relevant">✓ Relevant</div>
    </div>

    
    <div class="card-slot irrelevant" id="card-2">
      <div class="card-icon">🦈</div>
      <div class="card-label">Sharks swim fast</div>
      <div class="status-tag status-irrelevant">✗ Irrelevant</div>
    </div>

    
    <div class="card-slot relevant" id="card-3">
      <div class="card-icon">🧈</div>
      <div class="card-label">Fat blubber layer</div>
      <div class="status-tag status-relevant">✓ Relevant</div>
    </div>
  </div>

  <div class="controls">
    <button class="btn-nav" id="prevBtn" aria-label="Previous">◀</button>
    <div class="dots-container">
      <button class="dot-btn active" data-idx="0" aria-label="Detail 1"></button>
      <button class="dot-btn" data-idx="1" aria-label="Detail 2"></button>
      <button class="dot-btn" data-idx="2" aria-label="Detail 3"></button>
      <button class="dot-btn" data-idx="3" aria-label="Detail 4"></button>
    </div>
    <button class="btn-nav" id="nextBtn" aria-label="Next">▶</button>
  </div>

  <script>
    let currentIdx = 0;
    const totalCards = 4;
    const cards = Array.from(document.querySelectorAll('.card-slot'));
    const dots = Array.from(document.querySelectorAll('.dot-btn'));
    let timer = null;

    function showCard(index) {
      currentIdx = (index + totalCards) % totalCards;
      
      cards.forEach((card, i) => {
        card.classList.toggle('active', i === currentIdx);
      });

      dots.forEach((dot, i) => {
        dot.classList.toggle('active', i === currentIdx);
      });
    }

    function startAutoPlay() {
      stopAutoPlay();
      timer = setInterval(() => {
        showCard(currentIdx + 1);
      }, 3200);
    }

    function stopAutoPlay() {
      if (timer) clearInterval(timer);
    }

    document.getElementById('prevBtn').addEventListener('click', () => {
      stopAutoPlay();
      showCard(currentIdx - 1);
      startAutoPlay();
    });

    document.getElementById('nextBtn').addEventListener('click', () => {
      stopAutoPlay();
      showCard(currentIdx + 1);
      startAutoPlay();
    });

    dots.forEach((dot, idx) => {
      dot.addEventListener('click', () => {
        stopAutoPlay();
        showCard(idx);
        startAutoPlay();
      });
    });

    startAutoPlay();
  </script>
</body>
</html>

Let's see how a writer uses notes from an article to build strong sentences.

## Worked Example: From Source Notes to Strong Writing

Suppose our topic is **How Emperor Penguins Survive Extreme Cold**.

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="aspect-ratio" content="4:3">
<title>Developing Facts and Details</title>
<script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
<style>
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: system-ui, -apple-system, sans-serif;
    color: #1e2945;
    background: #f8f9fa;
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    user-select: none;
  }

  .nav-bar {
    display: flex;
    gap: 8px;
    background: #e2e8f0;
    padding: 4px;
    border-radius: 999px;
    margin-bottom: 16px;
  }

  .toggle-btn {
    border: none;
    background: transparent;
    padding: 8px 18px;
    font-size: 14px;
    font-weight: 600;
    color: #64748b;
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.25s ease;
  }

  .toggle-btn.active {
    background: #ffffff;
    color: #0284c7;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  }

  .stage {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    width: 100%;
    max-width: 480px;
  }

  .card-tile {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 180px;
    position: relative;
    overflow: hidden;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
  }

  .developed .card-tile {
    border-color: #38bdf8;
    box-shadow: 0 4px 14px rgba(56, 189, 248, 0.15);
  }

  .icon-box {
    font-size: 40px;
    line-height: 1;
    margin-bottom: 12px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 60px;
  }

  .temp-gauge {
    width: 14px;
    height: 52px;
    background: #e2e8f0;
    border-radius: 10px;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding: 2px;
  }

  .temp-fill {
    width: 100%;
    background: #0284c7;
    border-radius: 8px;
    transition: height 0.4s ease;
    height: 45%;
  }

  .developed .temp-fill {
    height: 15%;
    background: #0284c7;
  }

  .flock {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: -4px;
    position: relative;
  }

  .flock-sub {
    font-size: 20px;
    opacity: 0.3;
    transition: opacity 0.3s ease, transform 0.3s ease;
    transform: scale(0.7);
  }

  .developed .flock-sub {
    opacity: 0.9;
    transform: scale(1);
  }

  .flock-core {
    font-size: 38px;
    z-index: 2;
  }

  .val-badge {
    font-size: 17px;
    font-weight: 700;
    color: #475569;
    letter-spacing: -0.2px;
    transition: all 0.3s ease;
    text-align: center;
  }

  .developed .val-badge {
    color: #0369a1;
    font-size: 20px;
  }

  .sub-tag {
    font-size: 13px;
    color: #94a3b8;
    margin-top: 4px;
    font-weight: 500;
    transition: color 0.3s ease;
  }

  .developed .sub-tag {
    color: #0284c7;
    font-weight: 600;
  }

  .spark {
    position: absolute;
    top: 10px;
    right: 12px;
    font-size: 13px;
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .developed .spark {
    opacity: 1;
  }
</style>
</head>
<body>

<div class="nav-bar">
  <button class="toggle-btn active" id="btnVague">Vague Idea</button>
  <button class="toggle-btn" id="btnFacts">Specific Facts ✦</button>
</div>

<div class="stage" id="stage">
  
  <div class="card-tile">
    <span class="spark">❄️</span>
    <div class="icon-box">
      <div class="temp-gauge">
        <div class="temp-fill"></div>
      </div>
      <span style="margin-left: 8px; font-size: 28px;" id="tempIcon">☁️</span>
    </div>
    <div class="val-badge" id="tempVal">Cold</div>
    <div class="sub-tag" id="tempSub">Vague idea</div>
  </div>

  
  <div class="card-tile">
    <span class="spark">✨</span>
    <div class="icon-box">
      <span class="flock-sub">🐧</span>
      <span class="flock-core">🐧</span>
      <span class="flock-sub">🐧</span>
    </div>
    <div class="val-badge" id="flockVal">Huddle</div>
    <div class="sub-tag" id="flockSub">Vague action</div>
  </div>
</div>

<script>
  const btnVague = document.getElementById('btnVague');
  const btnFacts = document.getElementById('btnFacts');
  const stage = document.getElementById('stage');
  
  const tempIcon = document.getElementById('tempIcon');
  const tempVal = document.getElementById('tempVal');
  const tempSub = document.getElementById('tempSub');

  const flockVal = document.getElementById('flockVal');
  const flockSub = document.getElementById('flockSub');

  function showVague() {
    btnVague.classList.add('active');
    btnFacts.classList.remove('active');
    stage.classList.remove('developed');

    tempIcon.textContent = '☁️';
    tempVal.textContent = 'Cold';
    tempSub.textContent = 'General statement';

    flockVal.textContent = 'Huddle';
    flockSub.textContent = 'Missing detail';
  }

  function showFacts() {
    btnFacts.classList.add('active');
    btnVague.classList.remove('active');
    stage.classList.add('developed');

    tempIcon.textContent = '🧊';
    tempVal.textContent = '-40°F';
    tempSub.textContent = 'Exact temperature';

    flockVal.textContent = '5,000 Birds';
    flockSub.textContent = 'Exact quantity';
  }

  btnVague.addEventListener('click', showVague);
  btnFacts.addEventListener('click', showFacts);
</script>

</body>
</html>

Notice how the writer did not just say "it is cold and they huddle." They included the exact temperature ($-40^{\circ}\text{F}$) and the specific group size ($5{,}000$ birds).

Does stuffing your paragraph with every fact you found always make it better?

A common mistake is listing every single fact you read, even when they do not connect.

If our topic is how penguins stay warm, mentioning that *"killer whales hunt adult penguins"* is a real fact, but it distracts from cold survival.

Before you write down a fact, ask yourself: *Does this detail help my reader picture or understand my main point?*

Developing Your Topic With Relevant Facts and Details. Develop an informative topic with relevant facts and concrete details drawn from sources.

Grade 4 Writing Strategies: Identify Supporting Details in Informational Texts (Skill 4-W.5 & W.4.2.b)

Interactive Essay Map: Organizing Topics, Supporting Facts, and Concrete Details

KS2 English: Developing Non-Chronological Reports with Factual Evidence and Elaboration

To achieve mastery in W.4.2.b, 4th grade students benefit from the 'Color-Coding Strategy' (green for topic sentence, yellow for supporting facts, blue for concrete details/data, orange for definitions). Explicit modeling using a think-aloud to filter out 'distractor facts' (interesting but off-topic) builds critical evaluative skills before drafting.

Developing Your Topic With Relevant Facts and Details

Facts and Concrete Details

Staying Relevant