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toefl subject nouns checklist comparatives adjectives parallel structures adverbs pronouns prepositional phrases verb revising writing cause/effect essay quantity inverted subject-verb indefinte pronouns verb tenses past participles after "have" paragraphs editing checklist for paragraphs tourism conference english activity business do make prepositions linking verbs to0efl posessive object irregular plurals countable uncountable singular plural passive parallel comparatives parallel comaparatives superlatives paired conjunctions coordinate conjunctions time expressions past perfect present perfect hotel