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，we
were
good,
或
we
were
students.
was是单数形式，主语只能用I，
I
was
good,
或
I
was
a
student.
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
they
did
well，副词well
可以用来修饰did
they
did
a
good
thing，后面可以接名词。
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