1. What is her weight?
2. My mother is interested in cooking for my family herself.
3. How much does this computer cost?
4. I often spend twenty minutes walking to school.
5. Robot is not able to help us do our homework. (nếu ko có not thì có thể sử dụng "robot is unable to help us do our homework.")
6. You don't have to clean every room in the house now. (have to = must)