按要求写句子。
1. May I go on a trip to Canada?（作否定回答）
____________, you ____________ ____________.
2. May I buy some books about Harry Potter?（作肯定回答）
____________, ____________ ____________.
3. My grandfather is old. He can't go to Beijing by himself. (用too…to合并句子)
My grandfather is ____________ ____________ ____________ go to Beijing by himself.
