need用在什么情况下是作情态动词?
1个回答
need作情态动词时,只在否定句和疑问句的情况下,后跟动词原形,这时候没有人称和数的变化.以need作情态动词时的一般疑问句,回答是Yes,...must/...have to.No,...needn't.
如：Need I clean my room? Yes,you must/you have to.No,you needn't.
You needn't do your homework. He needn't take a taxi.
need作实意动词时,有人称和数的变化,用法结构为① need sth. ② need to do sth.
在疑问句和否定句中也是有实意动词情况的,这时候用法和其它的实意动词一样,否定句和疑问句需要助动词来完成,但不能脱离它作为实意动词的结构.
如：You don't need some water. You don't need to take a walk.
She doesn't need a cup of tea. She doesn't need to take some medicine.
Do you need a pen? Does it need to clean?
Which book does he need? What do you need to know?
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