情態(tài)動(dòng)詞must和have to,dare和need的用法

編輯: 逍遙路 關(guān)鍵詞: 初中英語 來源: 高中學(xué)習(xí)網(wǎng)
情態(tài)動(dòng)詞指本身有一定的詞義,用來表示語氣的單詞,但是不能獨(dú)立作謂語,只能和動(dòng)詞原形一起構(gòu)成謂語,情態(tài)動(dòng)詞雖然數(shù)量較多,用途廣泛,是各類考試都一定會(huì)考查的重點(diǎn)。這次就來和大家講講must/have to,dare/need這兩組詞的用法。

must/have to:

① 表示必須、必要,在回答問句時(shí),如果是否定的,必須用needn’t, don’t have to

eg. ---- Must I finish my homework before dinner?

---- Yes, you must.

---- No, you don’t have to / you needn’t.

② must是說話人的主觀看法, 而have to則強(qiáng)調(diào)客觀需要,have可根據(jù)時(shí)態(tài)人稱的變化而變化

eg.That film is interesting,I really must go to watch.

You have to get to school before 8 am.

③ 表示推測(cè)、可能性(只用于肯定的陳述句)

eg.You must know that,you are a teacher.


dare/need:

① dare作情態(tài)動(dòng)詞用時(shí), 常用于疑問句、否定句和條件從句中

eg.How dare you say that to me?

② need 作情態(tài)動(dòng)詞用時(shí), 常用于疑問句、否定句

eg. Need I finish my homework before dinner?

③ dare和 need也可以做實(shí)義動(dòng)詞來用,獨(dú)自充當(dāng)謂語。

eg.The little girl dares to go to school by herself.


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