were/was分别是be动词are/am的过去式,后面接形容词做表语,获接名词做宾语. 　　were是复数形式,主语只能用we,weweregood,或wewerestudents. 　　was是单数形式,主语只能用I,Iwasgood,或Iwasastudent. 　　did是动词do的过去是,主语可以是单数也可以是复数,you,he/she,they,it等都可以做主语 　　theydidwell,副词well可以用来修饰did 　　theydidagoodthing,后面可以接名词.