would,could ,should的用法

I wish you would stay.
我希望你能留下来
Used to make a polite request:
用于有礼貌的请求：
Would you go with me?
你愿意和我一起去吗?
Used to indicate uncertainty:
表示不确定之意：
It would seem to be getting warmer.See Usage Note at if
天气似乎变得更暖和了参见 if

would
[wEd, wJd]
v.
（略写为'd，否定式的略写为 wouldn't [wJd(E)nt] ）
(will 的过去式）
They said it would be fine.
听说天气会很好。
I would give anything to see the film.
假如可能的话,我怎么也要看一看这部电影。
Would you like some cake or biscuit?
你要吃点蛋糕还是并干?
He said he would come.
他说他要来。
（表示过去的习惯）常，有…的习惯
She would lose the key!
她总是把钥匙弄丢了。

would rather
宁可…也不；宁愿
Which would you rather do, go to cinema or stay at home?
你是去看电影还是待在家里？
Would rather die than surrender.
宁死不投降。

I could run faster then. It could be no better at that time. Only men could go to the club in those days.
那时我能跑得更快。那时好得不能再好了。在当时，只有男人可以去俱乐部
Used with hyp