常见句型：

1、宾语从句中

当主句动词采用一般过去时的时候，其宾语从句中的谓语动词如果原本该用一般将来时的，但要改为过去将来时。这种用法主要出现在间接引语中。I asked the man opposite if he would open the door.我问对面的人他愿意不愿意开门。I always said he would wind up in jail.我常说他到头来非进监狱不可。

2、虚拟条件句中

在if引导的虚拟条件句中，其主句动词往往要采用would do的用法。If he were you, he would reconsider my proposal.他要是你，他会重新考虑我的建议。He would pass out if he took one more drink.要是他再喝一杯酒的话，他就会醉倒了。

3、as if/though引导的虚拟语气句型中

as if/though表示好像，其引导的从句谓语动词要采用虚拟语气，所以有的句子就要采用would do的用法。I felt as if my heart would burst with joy.我觉得自己高兴得心花怒放。He felt as though he would faint out.他感觉彷佛要昏过去了。

4、would rather句型中

would rather do表示宁愿做什么。We would rather die than surrender.我们宁死而不投降。I would rather die than live in disgrace.我宁可死，也不愿忍辱偷生。

5、would like to句型中

would like to do表示想要做什么。I would like to have a word with you.我想同你说句话。)Many people would like to take holidays abroad.许多人愿意到国外度假。