题里给出了need,怎么判断是实义动词还是情态动词

Question

如题所述

Answer 1

You need"t( ) zhe plant.
A to water B water C .... D ....
为情态动词
因为
实义动词　主+need +to do 　　主+need +doing =sth+need +to be done 　　(都是实义动词，注意其否定为主+don‘t/doesn't+need +to be done或主+needn’t +be done
根据你给的选项可以得知A不符合

当need为情态动词时，意思是“必要”，否定为"needn't"，后面大多接动词原形，表示动作； 　　当need为实义动词时，意思是“需要”，否定为"don't need",后面大多跟名词。

Answer 2

后跟的是动词原形就是情态动词，动词不定式就是实义动词追问

是一个选择题，题是You need"t( ) zhe plant.
A to water B water C .... D ....
正确答案是B，这种情况怎么判断？

Answer 3

need作为动词，有两种理解，一是做情态动词，二是做行为动词。
1）need作为情态动词时，一般不用于肯定句，只用于否定句/疑问句。
其后直接加动词原形，没有时态/人称的变化。
其否定句为在need后面直接加not，或使用缩写needn't.
如：I needn't work hard.
其疑问句必须把情态动词need提前，回答也一般借助于need.
如：Need I help you?
2）need作为行为动词时，可用于各种句子，有过去式needed和三单形式needs.
其否定句必须借助于助动词don't/doesn't/didn't等变化。
如：I don't need to work hard.
其疑问句也必须借助于助动词do/does/did等变化。
如：What do you need me to do?
其结构一般有：
need sb/sth 如：I need you. I need your help.
need to do sth 如：I need to work harder.
need sb to do sth 如：I need you to help me.
need doing = need to be done 如：My watch needs repairing. = My watch needs to be repaired