如何区分need是实义动词还是情态动词？

如何区分need是实义动词还是情态动词？

need v.
做实意动词时，有两种用法：
1.need to do sth.需要做某事
e.g I need to study hard for th exam.我需要为了考试努力学习。
He needed to drink some water.他需要喝些水。
2.need doing sth. 需要被做某事（=need to be done sth.）
e.g The flowers need watering every day.花需要每天（被）浇水。
=The flowers need to be watered every day.
The classroom needs cleaning.教室需要（被）打扫。
=The classroom needs to be cleaned.
做情态动词时，通常只用疑问式或否定式。
其否定式常用于回答Must 的疑问句
e.g -Must I finish it today?
-No,you needn't
其疑问式用于构成疑问句
e.g -Need I wear a coat?
-Sure,it's cold.

情态动词加动词原形，，否定时直接加not，疑问句时可提前

She need drink some water.

She needn't drink any water.

Need she drink any water?

What does she need?

实义动词后加to do或doing或名词，主语是第三人称时要加s,否定疑问要用助动词do/does

She needs to drink some water.

She doesn't need to drink any water.

She needs some water.

Does she need any water?

need to do sth 需要做某事

need doing sth 需要被做某事

The flowers need watering every day.花需要每天浇水 =The flowers need to be watered every day.

最简单的办法。教给你。 need do sth时，作情态动词，不翻译。动词need to do/doing时，作实义动词，有实际意义。

教你个简单的方法。当它在这个句子中有意思时就是实义动词，当它没意思时只作辅助作用，就是情态。

这个问题很简单，当need后接的是不定式或者动名词形式时，他就是示实意动词。当它放在句首来提问时就是以情态动词出现的，如:Need I go to shool early tomorrow? yes,you need; no you needn"t