do后面的動詞什么形式

這個要看do是做實義動詞，還是助動詞了。具體根據上下文來確定。如果是助動詞用法的話，那就直接加動詞原形。如果是實義動詞的用法，是直接跟賓語的，那么如果是加動詞的話，就要用動詞的-ing形式，即動名詞形式。

do的用法

1.do用于一般現在時

例句:I often do my homework in the evening.

2.does用于第三人稱單數的一般現在時

例句:He does his lessons every day.

3.did用于一般過去時

例句:They did homework yesterday.

4.doing常用于現在進行時或者非謂語動詞(暫時不提)

例句:He is doing his homework now.

5.done 常用于完成時，被動態或者非謂語動詞(暫時不提)

例句:He has done his homework.

do作為助動詞用法

1.一般疑問句

例句:Do you like English?

2.選擇疑問句

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

3.特殊疑問句

例句:How do you go to school?

4.反義疑問句

例句:You like English, don't you?

5.否定句

例句:I don't like English.