什么时候用need,什么时候用need to,什么时候还是情态动词,
来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/09/13 05:40:20
什么时候用need,什么时候用need to,什么时候还是情态动词,
一.用作实义动词 作为实义动词
1.need sth.
Eg.Does he need your help No,he doesn’t .What do you need?He needs more money.
2.need doing = need to be done
Eg.Our classroom needs cleaning.= Our classroom needs to be cleaned.
3.need to do sth.
Eg.1).What do we need to take,books or magazines
2).Our classroom needs to be cleaned.= Our classroom needs cleaning.
二.用作情态动词.1.没有人称和数的变化.2.不能单独充当谓语.情态动词必须与一个实义动词一起构成复合谓语,并且这个实意动词要始终是动词原形.3.变为否定句时只需在情态动词之后直接加not.4.变为疑问句时只需将情态动词提到主语的前面.这是情态动词的共性.
Need he help you?He need not read it again.
---Must we clean the classroom now?---No,you needn’t.
1.need sth.
Eg.Does he need your help No,he doesn’t .What do you need?He needs more money.
2.need doing = need to be done
Eg.Our classroom needs cleaning.= Our classroom needs to be cleaned.
3.need to do sth.
Eg.1).What do we need to take,books or magazines
2).Our classroom needs to be cleaned.= Our classroom needs cleaning.
二.用作情态动词.1.没有人称和数的变化.2.不能单独充当谓语.情态动词必须与一个实义动词一起构成复合谓语,并且这个实意动词要始终是动词原形.3.变为否定句时只需在情态动词之后直接加not.4.变为疑问句时只需将情态动词提到主语的前面.这是情态动词的共性.
Need he help you?He need not read it again.
---Must we clean the classroom now?---No,you needn’t.
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