句型转换。
1. This is a bus. (改为复数句子)
These ______ some ______.
2. He has never been to Shanghai, ______ ______?(反意疑问句)
3. He was doing his homework at 8:00 last night. (否定句)
He ________ ________ his homework at 8:00 last night.
4. It's very hot. (对画线提问)
______ the weather ______?
5. Please take care of your sister. (同意句)
Please ______ ______ your sister.