各举一个be+doing+while+be+doing和be+doing+when+did的例句,be最好为过去时
问题描述：
各举一个be+doing+while+be+doing和be+doing+when+did的例句,be最好为过去时
答
【be+doing+while+be+doing】：
I was watching TV while it was raining cats and dogs outsides.外面在下倾盆大雨时,我正在看电视.
I was doing my homework,when he came in.他进来时,我正在看电视.
【英语牛人团】倾情奉献,看完满意请记得及时采纳,