问题描述:
While I was talking with my teacher,I heard the telephone ringing
.请问后一句话heard+ringing是过去式加现在进行时吗?这算什么时态?
.请问后一句话heard+ringing是过去式加现在进行时吗?这算什么时态?
问题解答:
我来补答展开全文阅读