need做情态动词时,只能用在否定和疑问句中么

2024-12-04 18:34:57
推荐回答(3个)
回答1:

need作为情态动词时主要用在否定句和疑问句中,但是也可以用在有条件的肯定句中,这个条件是:肯 定句中必须含有某些含某种否定含义的词语,例如only ,but ,all,before等或者说句子中暗含某 种否定含义。
如 One need only consider the facts .言外之意,不必考虑别的事情
He need do it but once .言外之意,不必做一次以上。

回答2:

用于表示“需要,必要”之意.做情态动词时,仅用于否定句和疑问句,只有现在时,过去式要用needn't have,疑问式用need+人称?,否定式用need not(即needn't),
1.—Need we leave soon?
—Yes,you must.(No,you needn't)
2.You needn't have hurried.
(=It was not necessary for you to hurry,but you did).你当时不必这么匆忙.
3.He needs to see a doctor.(need to do)

回答3:

不是吧