2. We sang some English songs. 否定句: We didn’t sing some English songs. some 改成any 一般疑问句: Did you sing some English songs? 同上 3. They played football in the playground. 否定句:They didn’t played football in the playground. played改成play 一般疑问句:Did they played football in the playground? 同上 2) 这棵树要比那棵树高. This tree ( taller ) than that one. taller前面加一个is 4) 谁比你重? ( Whice haevier ) than you. 改为 Who is heavier than you?