根据主谓一致原则,主语为复数时,谓语动词也用复数,但当谓语为过去式,谓语就一种形式,不随主语的单复数而改变,如They
went
to
Beijing
last
year.否定时借助didn,t
加在动词前,不过动词需改为原形,如They
didn,t
go
to
Beijing
last
year..当谓语为系动词be
时,有单复数变化。如He
was
in
the
school.They
were
friends.
一般过去时
主语为复数时,
谓语动词
用过去式;
而否定形式是:
be动词过去式(were)
+
not;
助动词过去式(did)
+
not
+
行为动词原形;
情态动词过去式(must/should等)
+
not.