變一般疑問 時態(tài)為一般現在時 1 .加助動詞 do或 does (主語為第三人稱單數時）
2.還原動詞 （本身是原形時不用變）
e.g.They go to school every day.Do they go to school every day
He goes to schoo every day.Does he go to school every day
He does his homework every day .(句中does 是實意動詞do 的單三形式）
Does he do his homework every day?( 句首的does是加的助動詞,后面的do 是陳述句中的實意動詞does還原來的）
時態(tài)為一般過去時 1.加助動詞did 2.還原動詞
They went to school yesterday.Did they go to school yesterday?
He went to school yesterday.Did he go to school yesterday?
變否定 1.在主語后加助動詞don't /doesn't /didn't 2.還原動詞
They went to school yesterday.They didn't go to school yesterday.
They go to school every day.They don't go to school every day.
He goes to school every day.He doesn't go to school every day.拜托，中文