should, would, could 词形相近,用法不同
should 用法
“should” 通常用来“给建议”,比如:
That dress looks great on you. I think you should buy it.
这件裙子很合适你,我觉得你应该把它买下来。
could 用法
“could”的用法大概可归纳为三种:
1) 描述过去的能力,比如:
When I was young, I could jump over the fence.
当我小的时候,能跳过篱笆。
2) 描述未来的可能性,比如:
If we try to master English, I think we could travel around the world.
如果我们努力精通英语,未来可能会去环游世界。
3) 表达礼貌的请求,比如:
Could I have a cup of coffee ?
我可以来杯咖啡吗?
would 用法
“Would” 的用法通常分为两类:
1)描述不可能或不真实的情况,比如:
He would go to school like us if her parents were alive.
如果他的父母还活着,他就会跟我们一样去上学。 (他的父母已经不在了。)
2)表示礼貌的提供帮助,比如:
Would you like some tea?
您要喝点茶吗?