英语句子中的动词
一个完整的英语的句子至少有一个或一个以上的动词。当句子中出现两个或两个以上的动词时，除少数的情况下，第一个动词后面的动词往往要发生变化，（1）变成doing形式；（2）变成动词to do不定式形式；（3）变成done过去分词形式。
一、 第一个动词后面的动词不发生变化 (用动词原形) 的情况：
（一）有助动词do的问句和否定句：
Do you have a brother? No, I don’t have a brother. Does he have a car?
（二）有情态动词 can, must, may, need, shall, will, would, could的：
Can you drive a car? I must finish my work today. Will you come here tomorrow?
（三）有某些词组would rather (宁愿), had better (最好), 的：
I would rather stay at home on weekends. You had better go to see a doctor.
二、 第一个动词后面的动词往往要发生变化的情况：
（一）变成doing形式：
（1）在进行时态中：
He is watching TV now. They were playing basketball at five yesterday afternoon.
（2）在某些动词like, enjoy, mind, stop, forget, remember, suggest, consider后面：
My father likes watching TV. Would you mind my opening the door?
（3）在一些固定的搭配中：
We often go shopping on weekends. Shall we go swimming this afternoon?
（4）在一些感官动词 (see, watch, feel, hear, find, smell) 后面：
She could feel her heart beating wildly. Didn’t you hear my knocking?
I found John working at his desk. When I entered the room, I saw him reading a book.
（5）用在一些词组的后面：
The students are busy reviewing their lessons. It is no use telling him how to do it.
He couldn’t help crying when he heard the bad news.
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