done的意思是已完成的；煮熟的。其可作形容詞和動詞，作形容詞是意為合乎禮儀的；合乎規矩的；得體的；作動詞時意為做、幹。“would加have加done”是虛擬語氣，表示對過去事情的假設，意思是“本來會做”。
例句
I would have told you all about the boy's story,but you didn't ask me.
我本來會告訴你這個小男孩的故事，但是你沒有問我。
Without your help,I wouldn't have achieved so much.
沒有你的幫助，我是不會取得如此大的成績。
He could have passed the exam,but he was too careless.
本來他能夠通過考試，但是他太粗心。
