英文grammar問題

could and would sound more politely so that why you can always hear people more likely to say Could u do me a favor....otherwise, using "can you" doesnt mean you are wrong. Its just up to you that what kind of person you wanna be. Gentleman? or dude?

1. can的過去式
She could play the violin when she was five.
她五歲時便能拉小提琴了。
2. (用於假設語氣,表示與事實相反的設想)能,可以
I wish I could go to France.
但願我能去法國。
I would go if I could.-------------could既同法
能去我就去。
3. (表示可能性)可能
That could be my train.
那可能是我要乘的火車。
4. (用於婉轉語氣)能,可以
Could I smoke here?
我可以在這裡抽煙嗎?
Couldn't you try it again?
你可否再試一下?

1. (will的過去式,表示過去未來式)將-would
She said she would come.
她說過她會來的。
2. (表示意志)願,要;偏要
I told her to stop nagging, but she just wouldn't listen.
我叫她別再嘮叨,可她就是不聽。
3. (表示過去的習慣)總是,總會
He would sit silent for hours.
他常常接連好幾個小時默默地坐著。
4. (表示推測)大概,會
I think he would accept the invitation.
我想他會接受邀請的。
5. (表示喜歡,意願)願意,要,想
I would like to have a word with you.
我想同你說句話。
6. (表示虛擬,假設,條件等)要,將要;會,就會
If I were younger, I would join you in the expedition to the Antarctic.
如果我年輕些,我就會跟你們一起去南極探險。
7. (表示婉轉的請求)請
Would it be convenient for you to leave tomorrow?
明天走你方便嗎?
Would you please come tonight?
你今晚來一下好嗎?
8. (表示願望)但願,要是...多好
I wish you wouldn't smoke any more.
我希望你別再抽煙了。
9. 能,能夠
The hall would seat one thousand people.
這個大廳能坐一千人。



might >
1. (may的過去式)(表示可能,不確定,期望,許可等,相當於may,但更帶遲疑,婉轉等色彩)可能;可以
It might rain.
可能下雨。
2. (may的過去式)(用於表示與事實相反情況的假設語氣中)會,能
If you were older you might understand.
假如你年齡再大一點,你就會理解了。
3. (may的過去式)(表示請求或婉轉的責備)請;應該
You might at least apologize.
你至少應該道歉一下。

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其實分別只係有冇禮貌,用would,could會比較有禮貌係" 會唔會或可唔可以 " 咁既意思 " ,而用can,will,已經假定左你係" 可以或願意 " ,所以除非係熟人,如果唔係用返would, could會比較好..如果要人幫忙,當然要用禮貌一點既方式問,即could you了..