do后面的动词什么形式

这个要看do是做实义动词，还是助动词了。具体根据上下文来确定。如果是助动词用法的话，那就直接加动词原形。如果是实义动词的用法，是直接跟宾语的，那么如果是加动词的话，就要用动词的-ing形式，即动名词形式。

do的用法

1.do用于一般现在时

例句:I often do my homework in the evening.

2.does用于第三人称单数的一般现在时

例句:He does his lessons every day.

3.did用于一般过去时

例句:They did homework yesterday.

4.doing常用于现在进行时或者非谓语动词(暂时不提)

例句:He is doing his homework now.

5.done 常用于完成时，被动态或者非谓语动词(暂时不提)

例句:He has done his homework.

do作为助动词用法

1.一般疑问句

例句:Do you like English?

2.选择疑问句

例句:Does he go to school by bus or by bike?

3.特殊疑问句

例句:How do you go to school?

4.反义疑问句

例句:You like English, don't you?

5.否定句

例句:I don't like English.