do詞性

　　do是用于一般現在時(shí)的助動(dòng)詞，did則是用于一般過(guò)去時(shí)的助動(dòng)詞。done是do的過(guò)去分詞。do還有實(shí)義動(dòng)詞（有實(shí)在意義的動(dòng)詞）的解釋?zhuān)鹤�，干，等�？谡Z(yǔ)中，do 的否定式通常用縮寫(xiě)形式。例如，do not 略作don't，did not 略作didn't。助動(dòng)詞無(wú)法與be動(dòng)詞、動(dòng)詞原形一同使用。

　　do的用法

　　1. do用于一般現在時(shí)

　　例句:I often do my homework in the evening.

　　2. does用于第三人稱(chēng)單數的一般現在時(shí)

　　例句:He does his lessons every day.

　　3. did用于一般過(guò)去時(shí)

　　例句:They did homework yesterday.

　　4. doing常用于現在進(jìn)行時(shí)或者非謂語(yǔ)動(dòng)詞(暫時(shí)不提)

　　例句:He is doing his homework now.

　　5. done 常用于完成時(shí)，被動(dòng)態(tài)或者非謂語(yǔ)動(dòng)詞(暫時(shí)不提)

　　例句:

　　He has done his homework.

　　He had done his homework before he went out.

　　His homework is done.

　　作為助動(dòng)詞，常用于疑問(wèn)句和否定句。

　　1. 一般疑問(wèn)句

　　例句:Do you like English?

　　2. 選擇疑問(wèn)句

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

　　3. 特殊疑問(wèn)句

　　例句:How do you go to school?

　　4. 反義疑問(wèn)句

　　例句:You like English, don't you?

　　5. 否定句

　　例句:I don't like English.

　　另外，也可以用于表示強調, 此時(shí)需要重讀。

　　例句:He does need your help. (does重讀，強調確實(shí)需要幫助)

　　還有，也可以代替其他的動(dòng)詞，使句子更簡(jiǎn)練。

　　例句:

　　Who cleaned the windows?

　　Tom did.