1. be动词（am/is/are）

　　主语 be动词（原形） be动词（过去式）

　　I  am  was  He/she/it  is  was

　　We/you/they  are  were

　　2.助动词（do/does/did）

　　问句  答句

　　Do+非第三人称单数

　　＋动词原形…?

　　…do/don't

　　Does+第三人称单数

　　…does/doesn't

　　Did+所有主格

　　…did/didn't

　　问句  答句

　　What do you/they/we…

　　+动词原形？

　　I/They/We+动词原形…。

　　What does he/she/it…

　　He/She/It +(动词＋S)….

　　What did you/they/we/ he/she/it…

　　I/They/We/ He/She/It +动词过去式。