1)实义动词:有具体意思,可单独做谓语;
如:eat,read,love
2)情态动词:有具体意思,不可单独做谓语,要搭配实义动词一起使用;
如:can,could,may,might,shall,will...
3)助动词:无具体意思,不可单独做谓语。
如:be,do,have
例:
I play basketball. ------------------正确
I can play basketball. ------------正确
I can basketball. ------------------错误
注意:
A:Who can play basketball?
B:I can.
补充:
与情态动词意义作用相当的短语:
can--be able to
will--be going to
should--ought to/be supposed to
must--have to/have go to
半情态动词:
(可作情态动词,又可作实义动词)
need,dare
基本意思:可以,能;
could是can的过去式
另外:
1)可以表示判断
--what caused his cancer?
--It can be smoking.
--It could be smoking.
2)有时用could是为了让语气更委婉:
Can you help me?
could you please help me?
基本意思:可能,也许
基本意思:将,将要
would是will的过去式
will表将来:
would使语气更委婉:
基本意思:应该,应当
You should work hard.
另外:
It should be true.
基本意思:必须
You must word hard.
另外:
must>should>could>may>might
翻译:
1.明天我回来。
I will come back tomorrow.
2.你能帮我吗?
Could you please help me?
3.我会踢足球。
I can play football.
4.你应该写作业。
You should do homework.
5.你必须道歉。
You must apologize.
6.我可能会失败,但我不放弃。
I may lose,but I never give up.