would 
英 [wʊd]  美 [wʊd] 
v. 愿意，要，打算；以便；将，会；请；就；本来想；就（不）；将（will 的过去式）

例句：
It would cost very much more for the four of us to go from Italy. 

从意大利走，我们4人花的钱会多得多。

If you asked him he would do it. 

如果你要求，他会照办的。

If you had asked him he would have done it. 

如果你早要求他做，他应该已经照办了。

If only I could get some sleep, I would be able to cope. 

要是我能睡一会儿，我就能够应付。

My daughter would have been 17 this week if she had lived. 

我的女儿要是还活着，她这周就满17岁了。