句型转换 1. It’s a pear. (改为否定句) ______ ______ a pear. 2. You can sit down. (改为一般疑问句) ______ ______ sit down? 3. I am in Grade 2 .(对划线部分提问) ______ ______ ______ you in? 4. Is that a cake?(作否定回答) ______, ______ ______. 5. is, what, three, one, and(连词成句) ______ ______ ______ ______?