3个回答
1.肯：They were at their grandparents' (home) last night.（介词出现时，句子中一定要有动词或be动词）
否：They weren't at their grandparents' (home) last night.
疑：Were they at their grandparents' (home) last night?
2.There were no visitors in our home town ten years ago.
3.There were a lot of trees In the mountain two hundred years ago.
4.Was Jiaozuo snow last winter?
1.肯:They stayed at the grandparents' house last night.
否:They didn't stay at the grandparents' house last night.
疑问:Where were they last night?
2.Ten years ago there were no tourists in my hometown.
3.Two hunred years ago there were many trees in this mountain.
4.Was Jiaozuo snow last winter?
1They stayed at grangparents' home last night. They didn't stay at grangparents'home last night. Did they stay at grandparents' home last night?