would 是will的過去時態(tài).
would
1.用于表愿望、請求或建議的陳述之后.
例：I wish you would stay.我希望你能留下來.
2.用于有禮貌的請求.
例：would you go with me
3.表示不確定之意.
例：it would seem to be getting warmer.
would也可以表示過去反復(fù)發(fā)生的動作或某種傾向
will
助動詞：將；會；愿；要
例：he will come back soon.他很快就將回來了.
he will often sit up all night.他常常熬夜.
it will be fine tomorrow .明天將會放晴.
名詞：決心；遺囑；意圖；意愿；渴望；隨心所欲
例：let him do what he will .讓他做他想做的事情吧.
舉兩句歌詞給你看看
would you wait for me forever
will you wait for me forever
意思：
would有請求的意思 請求“你永遠(yuǎn)等我”
will是詢問 “你能永遠(yuǎn)等我么?”