Question

What would you do if you ______(win)millions of dollars 填什么？ 为什么有人添won 有人填win?

Answer 1

won
这个疑问句看起来有迷惑性，咱们把它变成肯定句再分析。
you would do **，if you ______(win)millions of dollars
很明显，这里是if 引导的虚拟条件句，是一种假设。主句用了 would do ，说明是同现在事实相反的假设，从句用一般过去式就好了（be 动词用were）
下附if引导虚拟式主从句变法：

当与过去事实相反时 主句用would/could/might/should+have done
从句用had done
例句：
If he had know your address yesterday,he would have telephoned you
如果昨天他知道你的地址，那他就打给你了。
If he had been there last night,it wouldn’thave happened.
如果他昨晚在那里，这事就不会发生。

与现在事实相反时 主句用would/could/might/should+do
从句一般过去时表示将来（be 动词都用were 哦）
例句：If I place were alike ,there would be little need for geographers.
If I were you,I should do that.如果我是你，我就那么做。

与将来事实相反 主句用would/could/might+do
从句用1were to do2 一般过去（be 动词都用were 哦）3should+do（三者取其一哦）
例句：
If anyone helped me,I would make him very rich.
如果有人把我放出来，我会使他富有。
If it should rain the crops would be saved.
如果有雨下，庄家就有可能救活。
If it were to snow tomorrow,they wouldn’t go for an outing.
如果明天下雪，他们就不外出游玩。