When Bob and his friends came,we were having our supper

问题描述:

When Bob and his friends came,we were having our supper

当鲍博和他的朋友过来时,我们正在吃晚饭

当鲍勃和他的朋友来的时候,我们正在享用晚餐。
then在这里是副词,表示“当时”。

当Bob和他的朋友来的时候,我们正在吃晚饭.