AI Tutor
Have you ever wondered why English keeps "silent" letters like the g in the word sign?
When you add an ending to make signal, that ghost letter suddenly wakes up and makes a loud /g/ sound.
What causes these sudden sound transformations when related words grow?

Consonant Alternation

A consonant shift (or alternation) happens when a consonant changes its sound or becomes voiced as a word takes on a suffix.
In base words like sign or hymn, English rules make the final consonants hard to say together at the end of a syllable, so one stays silent.
Adding a vowel suffix splits the consonants across two syllables, giving the silent letter an open position to be clearly spoken.
Consonants aren't the only sounds that changeβ€”what happens to the vowels inside a root?

Vowel Sound Shifts

A vowel shift occurs when the vowel sound in a base word flips from a long vowel to a short vowel in a related word.
This pattern is known as vowel laxingβ€”when words get longer by adding suffixes, the main vowel relaxes into a shorter sound to make the word faster to pronounce.