Should/ Could/would的用法辨析

Use for advice and opinion

（用于给出意见和观点）

1.A: I've had a really bad headache for the past week.

这一周以来，我的头疼得厉害。

B:That's not good-you should go to the doctor.

那可不是好现象-你应该去看医生。

2.A: I had a fight with my best friend.

我和最好的朋友吵架了，

What should I do?我怎么办？

B: Hmm...I think you should call her and tell her you're sorry

恩---，我觉得你应该打电话给她，跟她说对不起。

Use to talk about ability in the past.

(用来讨论过去的能力。)

Last year, he couldn't speak English very well, but

now he can.

去年他英语还无法讲得很好，但现在他可以了。

Use for possibilities now or in the future.

(用在推测现在或者将来的"可能情况")

1.The phone is ringing. It could be Jack.

电话响了，可能是杰克打来的。

2. I don't know when they'll be here.

They could arrive at any time.

我不知道他们何时来这里，他们可能随时会到。

Use for polite request.(用于客气和礼貌的请求。)

1.Could you please open the window?

能请你开下窗户吗？

It's hot in here.这里很热。

2.Could you turn down the TV?

你能把电视关小声点吗？

To talk about unreal or imaginary stituations

(用于虚拟想象的情形，也就是常说的"虚拟语气")

1.If I were the president of my company, I'd make a lot

of changes.如果我是公司的总裁，我会做很多改变。

2. She'd travel around the world if she had

more vacation time.

如果她有更多的假期，她会周游世界。

注：" Would"经常缩写为'd，I would=I'd

To make polite offers or request

(用于客气和礼貌的请求。)

1.Would you like anything to drink?

你想要喝些什么吗？

2.Would you please pass me that pen?

你能递给我那支笔吗？

和一个美国朋友对话，“would”的使用

和一个英国朋友的对话，“would”的使用