Correct: Modal verbs do not need operators in questions and negatives., Modal verbs are also called modal auxiliaries or defective verbs, Modal verbs have meaning; they have a lexical function, Operators have a grammatical function, Need and dare are semi modals, Incorrect: Modal verbs can be conjugated, Modal verbs have a past tense., Ought to is not a modal verb, Need and dare are called semi auixiliaries, permission, advice and obligation belong to the secondary function of modal verbs,

MODAL VERBS. SOME BASIC CHARACTERISTICS

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