情态动词后面加什么

　　情态动词后必须接动词原形，不能接带to不定式或动名词等。如：

　　我们应当学讲流利正确的英语。

　　误：We must to learn to speak English fluently and correctly.

　　误：We must learning to speak English fluently and correctly.

　　正：We must learn to speak English fluently and correctly.

　　注意，我们说的“动词原形”指的是紧跟在情态动词后面的那个动词用原形。事实上，情态动词后面的动词可用进行式、完成式、被动式等，只要保证第一个词是“原形”就行了。如：

　　She might be waiting for you. 她可能在等你。

　　You must have seen him. 你一定见过他了。

　　She may have missed her train. 她可能误火车了。

　　The road may be blocked. 这条路可能不通了。

　　The door must have been locked by my wife. 门一定是我妻子锁的。