It is two years since I became a postgraduate student.
It is two years since I became a postgraduate student.
这句话became是非延续性动词是吗?然后由since接的从句请问这是过去时态表示已经已经干嘛干嘛的事情吗?还有sonce这个词语后面要接句子的话,注意是句子一般接过去时态和完成时态,主要看动词是否延续性,非延续性动词就用过去时态造句对吗?还有比如造句说我已经结婚两年了,用since造句。