句型转换。
My mother did the housework yesterday afternoon.(用at five yesterday afternoon改为过去进行时)
My mother_______________the housework at five yesterday afternoon.
The students were having a picnic at the time last Sunday.(改为否定句)
The students _____________a picnic at that time last Sunday.
Maria wasgoingshoppingwithhermother at four yesterday afternoon.(对画线部分提问)
_______________________________at four yesterday afternoon?
Her mother was cooking when she got home.(改为一般疑问句)
________________________when she got home?
I was playing computer games when my brother came back.(改为同义句)
_________I was playing computer games，my brother came back.