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do既可以做实意动词又可以做助动词。
根据不同的用法，do可以化身为五种不同形态，分别是do，does，did，doing和done。
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.
He had done his homework before he went out.
His homework is done.
作为助动词，常用于疑问句和否定句。
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.
另外，也可以用于表示强调, 此时需要重读。
例句:He does need your help. (does重读，强调确实需要帮助)
还有，也可以代替其他的动词，使句子更简练。
例句:
Who cleaned the windows?
Tom did.
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