问题描述:
现在完成进行时的公式是have been+v.ing例如:I‘ve been skating for five years.
但是后来参考书上又写了一句话I've lived in this city for three years.这句话为什么没有加been,两句有什么区别啊.
但是后来参考书上又写了一句话I've lived in this city for three years.这句话为什么没有加been,两句有什么区别啊.
问题解答:
我来补答展开全文阅读