1.it was expensive.(改成一般疑问句)2.They were at home yesterday(改成一般疑问句)

问题描述:

1.it was expensive.(改成一般疑问句)2.They were at home yesterday(改成一般疑问句)
3.You are cooking.(改成一般疑问句)

Was it expensive?
Were they at home yesterday?
Are you cooking?