will 的用法
will 作情態助動詞時，表示請求、邀請，常用於疑問句。如：
Will you mail this letter, please?
請把這封信替我寄一下好嗎？
If you want help, let me know, will you?
需要幫忙就告訴我，好嗎？
Pass the book, will you?
請把那本書遞給我，好嗎？
Won't you go to the party?
去參加晚會好嗎？
Won't you have some milk?
喝點牛奶吧？
Will you come in＝Please come in.
請進來。
Will you please shut the window?
請你把窗戶關上，好嗎？
would 的用法
1）表示主觀意志、可能性、有傾向或有條件性的習慣。如：
He wouldn't go, so I went instead of him.
他不願意去，所以我替他去了。
That's just what he would want.
那正是他想要的。
Blanche wouldn't listen to anybody.
誰的話布蘭奇也聽不進去。
2）表示請求或徵求意見。如：
Would you like a cup of tea?
要喝杯茶嗎？
What would you like to drink?
你想喝點什麼？
Kenneth asked me if I would join them?
肯尼斯問我是否想加入到他們中去。
3）用於虛擬語氣，在說明現在或將來時間範疇的情況時，would 屬於虛擬用法，與第二、三人稱連用，可以表示願望、驚訝或可能性等。如：
I wish it would be fine at the weekend.
但願周末天氣會好。
If I were you, I wouldn't go.
我要是你，我就不去。
Perhaps you wouldn't believe it, but it s true.
你或許不會相信，但這是真的。
I would rather you came tomorrow than today.
我倒是想讓你明天來，別今天來。
4）表示重複發生的動作。如：
Sometimes he would come to see us.
他有時來看看我們。
Every evening he would come to say goodnight.
每天晚上他都來道晚安。
5）表示過去的一種傾向。如：
Martin said the door wouldn't open.
馬丁說門打不開。
The wound would not heal.
傷口老是癒合不了。
6）表示一種揣測。如：
That would be our new teacher.
那大概是我們的新老師。