was和were后面加动词的什么形式? 在什么时候要加原形,什么时候加动词ing
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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.
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.
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