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)
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)
答
1.Was it expensive？
2.Were they at home yesterday？
3.Are you cooking？
望采纳，一定正确的。祝你学习愉快！
答
are you cooking？你在烹饪么？
答
Was it expensive?
Were they at home yesterday?
Are you cooking?