Vocabulary Acquisition and Use4. Determine or clarify the meaning of unknown and multiple-meaning words and phrases based on grade 2 reading and content, choosing flexibly from an array of strategies.a. Use sentence-level context as a clue to the meaning of a word or phrase.b. Determine the meaning of the new word formed when a known prefix is added to a known word (e.g., happy/unhappy, tell/retell).c. Use a known root word as a clue to the meaning of an unknown word with the same root (e.g., addition, additional).d. Use knowledge of the meaning of individual words to predict the meaning of compound words (e.g., birdhouse, lighthouse, housefly; bookshelf, notebook, bookmark).e. Use glossaries and beginning dictionaries, both print and digital, to determine or clarify the meaning of words and phrases.