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grammar basic grammar pas study guide grade 12 review proper nouns common nouns gerunds present conditionals notes 10 grade vocabulary julius caesar 11 grade walden answered idioms geruinds meaning functions spark summary sparks pearl steinbeck shakespeare economy thoureau essay proposal research paper panamerican school writing ten sentences grade correct practice verbs pronouns parts of speech masculine feminine nouns collective nouns plural nouns singular nouns capital letter past regrets modals advisability adverbs placement types