陈述句，would可以表示推测。例句：It would be more economical to buy the bigger size.买尺寸大点的更实惠。

双语例句

1、It would be a good idea to call before we leave.

我们出发之前打个电话是个好主意。

2、Just think how nice it would be to see them again.

试想一下要是能再见到他们该有多好。

3、Perhaps it would be better if you came back tomorrow.

如果你明天回来，也许更好。

4、It would be preferable to employ two people, not one.

雇请两个人比雇请一个更好。

5、It would be interesting to know what he really believed.

了解他的真实信仰会是很有意思的。