English Language Arts ELA2021 (2021) Grade: 4 | 39. Demonstrate command of the conventions of standard English grammar and usage.
a. Use relative pronouns who, whose, which, and that, relative adverbs where, when, and how, and irregular possessive nouns.
b. Form and use the progressive verb tenses.
Examples: I was walking, I am walking
c. Use modal auxiliaries to convey various conditions.
Examples: can, may, must Unpacked Content
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