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Definition of Auxiliary Verbs: the word help the main verb making a tense

Definition of Auxiliary Verbs: the word help the main verb making a tense. 兼用助動詞 ︰am, is, are, was, were, have, has, had, do, does, did, need, dare, used 專用助動詞（亦稱“情態助動詞”） ︰shall, should, will, would, can, could, may, might, must, ought, had better. 1. 兼用助動詞 ︰ 既可當助動詞又可當主動詞的動詞.

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Definition of Auxiliary Verbs: the word help the main verb making a tense

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  1. Definition of Auxiliary Verbs:the word help the main verb making a tense 兼用助動詞︰am, is, are, was, were, have, has, had, do, does, did, need, dare, used專用助動詞（亦稱“情態助動詞”）︰shall, should, will, would, can, could, may, might, must, ought, had better

  2. 1.兼用助動詞︰既可當助動詞又可當主動詞的動詞1.兼用助動詞︰既可當助動詞又可當主動詞的動詞 • am, is, are, was, were, have, has, had, do, does, did, need, dare, used

  3. 2.專用助動詞︰只可作助動詞不可當主動詞的動詞2.專用助動詞︰只可作助動詞不可當主動詞的動詞 shall, should, will, would, can, could, may, might, must, ought, had better • You should study hard. • He can run very fast. • Mary may not come tomorrow.

  4. 3. 助動詞的特點︰ (1) “專用助動詞”無人稱與數的變化 • I (He, Lisa, We, They) must study hard. • You can run fast, and he can too. (2) “專用助動詞” 中僅ought後接to V，其 餘皆直接加動詞原形 • You ought to be very careful. • He will buy a gift for you.

  5. (3)“兼用助動詞”之後有的有to，有的則無 • I don’t know him. • I have to leave for Taipei now. (4) need（必需/需要）/ dare（敢）在否定句及疑問句中要加省略to的不定詞 • I daren’t go out alone at night. • Need I get up at five a.m. tomorrow?

  6. (5) 過去式的助動詞未必指過去的事，可能是指現在或未來，除非上下文有明顯的過去時間或談到過去的事 • Could you lend me a pen? 《註》請問或拜託時，用could比較正式； 也可用can，但多用於熟人的情況，would情況亦類似

  7. You should take care of your dog carefully. 《註》 should除作shall的過去式外，在表示主詞的責任或義務“應該” 時要用should而非shall

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