按要求完成下列各题。
1. Open the door. (改为否定句)
________ open the door.
2. I think English is easy to learn. (改为否定句)
I ________ ________ English ________ easy to learn.
3. I am going to Shanghai. (对画线部分提问)
________ ________ ________ going?
4. I found a beautiful dress. (对画线部分提问)
________ ________ you ________?
5. You must (必须) go to bed early. (改为祈使句)
________ ________ ________ early.