Write a small set of heart words (common words with a tricky part) correctly from memory.
Some words do not sound the way you would expect when you stretch them. We call these heart words because you learn them by heart.
The word "the" has a tricky part. You cannot just sound it out the regular way. You have to remember it, like a word you know well.
Mastery looks like: They write a small set of heart words correctly from memory, without sounding them out letter by letter.
Common stumbles: Trying to sound out the tricky part instead of remembering it; forgetting a heart word learned in an earlier week without review.
See it visually
Interactive, spoken-aloud tools that show this idea in motion.