was和were后面加动词的什么形式

Answer 1

答：它们是be动词的过去式
一、作助动词：
1.　现在分词，构成过去进行时态：
he
was
reading.
2.
过去分词，构成被动语态：　
they
were
defeated.
二、作系动词
3.　现在分词、动名词短语作表语：
　　the
film
was
moving.
his
job
was
teaching
english
.
4.　过去分词作表语：
　　we
were
moved.
5.
不定式作表语：
　1）有to不定式：his
work
that
day
was
to
clean
the
blackboard.
2)
无to
不定式：what
he
should
do
is
clean
the
blackboard.