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在She used to be a Chinese teacher中be做什么成分

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在She used to be a Chinese teacher中be做什么成分
在She used to be a Chinese teacher中be做什么成分
e 做谓语动词
used to 在这里相当于一个情态动词,表示某事在过去常常发生,或者在过去某个时期一直是某种状态,但是现在已经不是了
由于是modal verb,所以后面接动词原型be
used to
modal verb
1 if something used to happen,it happened regularly or all the time in the past,but does not happen now
He used to go to our school.
2 if a particular situation used to exist,it existed for a period of time in the past,but does not exist now
Jimmy used to be a friend of mine.