must,need,mustn't,needn't的用法?
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must,need,mustn't,needn't的用法?
must表示必须、义务等,相当于have to,但must强调主观因素,而have to强调客观因素.
I must go to see a doctor.
我得看医生去.
need可以对MUST引导的一般疑问句作否定回答.
Really?Must I go with you?
是吗?要我和你一起去吗?
No,you needn't.
不,没必要.
must的否定式表示不准,不得等禁止的意思,或表示不可,不能,一定不要等劝告的意思.
Ok,then,you mustn't forget your medical card.
好吧,那你一定不要忘记带医疗证.
我有必要说吗?作为情态助动词的need一般只用于否定句或疑问句中,need+原形动词表示必要性.
Of course I remember.Need you remind me?
我当然记得了.你有必要提醒我吗?
must+have+过去分词表示对过去情况的推断.
Oh,it is wet outside.It must have rained yesterday.
噢,外面湿了.昨天想必是下雨了.
must+原形动词表示对现在情况的推断.
So it must be slippery outside.Do be careful!
所以外面一定滑.一定要当心.
need可用于假设语气,一般用于否定句中,后接不定词的完成式,needn't+have+过去分词表示过去不必做却已经做了的事.
I am not a little boy!You needn't have told me that much.
我不是小孩子.你不必和我讲那么多.
I must go to see a doctor.
我得看医生去.
need可以对MUST引导的一般疑问句作否定回答.
Really?Must I go with you?
是吗?要我和你一起去吗?
No,you needn't.
不,没必要.
must的否定式表示不准,不得等禁止的意思,或表示不可,不能,一定不要等劝告的意思.
Ok,then,you mustn't forget your medical card.
好吧,那你一定不要忘记带医疗证.
我有必要说吗?作为情态助动词的need一般只用于否定句或疑问句中,need+原形动词表示必要性.
Of course I remember.Need you remind me?
我当然记得了.你有必要提醒我吗?
must+have+过去分词表示对过去情况的推断.
Oh,it is wet outside.It must have rained yesterday.
噢,外面湿了.昨天想必是下雨了.
must+原形动词表示对现在情况的推断.
So it must be slippery outside.Do be careful!
所以外面一定滑.一定要当心.
need可用于假设语气,一般用于否定句中,后接不定词的完成式,needn't+have+过去分词表示过去不必做却已经做了的事.
I am not a little boy!You needn't have told me that much.
我不是小孩子.你不必和我讲那么多.
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