英語中什么時候用do和does
1、do和does可以用作實義動詞，在一般現(xiàn)在時肯定句中，其中does用在第三人稱單數(shù)，do用在其它人稱中，如：
He does his homework everyday.
I do excercise every Fridday.
2、do和does可以用作助動詞，完成一般現(xiàn)在時的問句及回答和否定句中，其中does用在第三人稱單數(shù)，do用在其它人稱中，如：
Do you love me?/No, I don't.
Does he go to school everyday?/Yes, he does.
What do you do on Satudays?(第一個do)
What does he do every morning?
I don't like snakes.
He doesn't want to study English.
3、do可以作為實義動詞，代替所提問的動作，用在特殊疑問句的各時態(tài)中，如：
How do you do?（第二個do）
What did you do last night?