Quick answer
What L.1.1 means in plain English
L.1.1 is the big grammar umbrella for grade 1, and it covers a lot: printing every uppercase and lowercase letter, using nouns and verbs that match (he hops, we hop), showing past, present, and future with verbs (walked, walk, will walk), plus pronouns, adjectives, little connector words like and, but, and because, and words like the, this, and toward. It all points at one goal: your child can build and expand complete sentences, spoken and written, including questions, commands, and exclamations.
Why parents see this skill
Why this matters
Grammar at this age isn't about memorizing rules; it's the toolkit for saying and writing exactly what he means. A first grader who controls tense and subject-verb matching writes stories people can follow, and every writing standard from grade 2 on quietly assumes these pieces are in place.