would后面加动词原形。would作为情态动词或者助动词，其后加动词原形，不可能加动词的单数第三人称形式。最基本的三种搭配为一般式would do sth；进行式would be doing sth；完成式would have done sth。
例句
That would be best, Your Highness.
那就再好不过了，殿下。
He wondered idly what would happen.
他漫不经心地幻想着会发生什么事。
What would you propose?
你想提什么建议？
