Susana Dutro's ELD Matrix of Grammatical Forms outlines the grammatical structures students should understand and produce at different levels of English language proficiency. It covers verbs, nouns, pronouns, prepositions, conjunctions, adjectives, and adverbs. As proficiency increases, students learn more verb tenses and forms, advanced grammatical structures like passive voice, and idiomatic expressions. The matrix provides a progression of linguistic complexity to guide instruction across beginning, intermediate, and advanced levels of English development.