Say a sentence out loud, count how many words it has, and write it with a word for every count.
Before you write a sentence, it helps to know how many words are coming. Say your sentence, then count the words on your fingers.
Each finger is one word. If you say "I like dogs," that is three fingers, three words.
Mastery looks like: They say a sentence, correctly count its words on their fingers, and write a matching number of words in order.
Common stumbles: Losing track of the count partway through; writing more or fewer words than they counted; forgetting the sentence before finishing writing it.
See it visually
Interactive, spoken-aloud tools that show this idea in motion.