句型转换。 1. Her blue pants are twenty dollars. (改为一般疑问句,并作否定回答) _______ her blue pants twenty dollars?   No,_______ _______. 2. The yellow shirt is fifteen yuan .(对画线部分提问) _______ is the yellow shirt? 3. My new shorts are blue .(对画线部提问) _______  are your new shorts? 4. The boy in green is my brother. (对画线部分提问) _______ _______  is your brother? 5. Can I help you? (改为同义句) _______can I_______ for you? 6. This sweater is  ￥60. (改为复数句) _______ _______ _______ ￥60. 7. She wants a black bag. (改为一般疑问句) _______she_______ a black bag?