改写句子。
（1）We cook some tofu for dinner every day.（改过去时）
We         some tofu for dinner yesterday. 
（2）They listened to music the day before yesterday.（改否定句）
They                   to music the day before yesterday. 
（3）I washed the dishes after dinner yesterday.（改一般疑问句，作肯定回答）
             you         the dishes after dinner yesterday?        , I        .
（4）They cleaned the classroom last Sunday.（就划线部分提问）
             they do last Sunday?