分别将下列句子改成一般疑问句.否定句.并作肯定和否定的简略回答1.we had lessos yesterday.2.The stdents showed us their pictures yesterday morning.3.The teachers cleaned their offices yesterday afternoon.4.The poilceman watched a tennis match yesterday evening.

1.Did you have lessos yesterday?Yes,we did.No,we didn't.
we didn't have lessos yesterday.
2.Did the stdents show you their pictures yesterday morning?Yes,they did.No,they didn't.
The stdents didn't show us their pictures yesterday morning.
3.Did the teachers clean their offices yesterday afternoon?Yes,they did.No,they didn't.
The teachers didn't clean their offices yesterday afternoon.
4.Did the poilceman watch a tennis match yesterday evening?Yes,they did.No,they didn't.
The poilceman didn't watch a tennis match yesterday evening.