do

donot与don’t的意思都是一样的，don`t就是donot的缩写，它们有个小小的区别，那就是，donot的语气要比don’t的语气更为强烈，有强调的作用。

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?