本文目录
英语中的介词很多，它们常常和动词搭配使用。不过，有时候很容易犯错，例如忘记加上正确的动词形式。那么，介词后面到底应该加什么形式的动词呢？
加ing形式的动词
一些介词后面要加的是ing形式的动词，例如：
- by + doing something
- after + doing something
- before + doing something
- without + doing something
这些介词后面的动词都必须是ing形式的动词。例如：
- She learned English by watching TV.
- After finishing her homework, she went to bed.
- Before going to work, he had breakfast.
- He left the house without saying goodbye.
加to形式的动词
另外一些介词后面要加的是to形式的动词，例如：
- look forward + to doing something
- prefer + doing something to doing something else
- be used + to doing something
这些介词后面的动词都必须是to形式的动词。例如：
- I'm looking forward to seeing you.
- I prefer reading books to watching TV.
- He is used to getting up early.
加原形动词
还有一些介词后面要加的是原形动词，例如：
- let + someone + do something
- make + someone + do something
- help + someone + do something
- need + to do something
这些介词后面的动词都必须是原形动词。例如：
- She let me borrow her car.
- He made me do my homework.
- She helped me carry my bags.
- I need to study for my exam.
总之，在使用介词时，一定要注意它们后面应该加什么形式的动词。正确使用介词和动词能够让你的英语更加流利自然。
