English Auxiliary Verbs
operator
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ESL Recipe Lesson Plan: Practice the Imperative Mood
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Grammatical Forms of English Verb Phrases
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Using Auxiliary Verbs as Operators
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The Operator in English Grammar
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Grammatical Functions of English Auxiliary Verbs
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The Imperative Mood of English Verbs
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Grammatical Functions of Verbs in Predicate Verb Phrases
