按要求完成句子。 1. She can help you. (改为否定句) She _______ _______ you. 2. He would like to play basketball with us. (改为一般疑问句) _______ he _______to play basketball with us? 3. He has to visit his uncle. (改为否定句) He _______ _______to visit his uncle. 4. They can play the piano. (就画线部分提问) _______ can they _______? 5. They can't go to the party. (改为否定祈使句) ________ ________ ________ the party. 6. Can the children swim in the river? (作否定回答) _______ _______ _______.