根据要求改写句子,每空一词.
1.My mother was ( talking to Mrs Brown ) when I got home.（对括号内部分提问）
_______________ was your mother ______________ when you got home?
2.There will be less pollution in the future.(改为一般疑问句)
_______________ ______________ be less pollution in the future?
3.He should (buy a computer for his son).(对括号内部分提问)
_______________ should he _______________?
4.Now your uncle is playing football.(改为过去进行时)
Your uncle ___________ ____________ football at this time yesterday.