Lily could not sing and dance.───── ── ────

and - or解析： could not 否定,否定句用or祝你学习进步,更上一层楼! (*^__^*) 不明白的再问哟,请及时采纳,多谢! 再问： and没错，错误的是could not（缩写形式） sing dance的其中一个 再答： 错在： could not 应该缩写成： couldn't再问： 我打不出缩写形式= =， 再答： Did you went to the zoo？ 中的 went 错，应该改为 go 解析： Did + 主语+ 动词原形再问： Lily couldn't sing and dance。 因为couldn't否定不能用and，就把couldn't改为could？ 再答： 好主意 这句话可以改为： Lily could sing and dance。 或： Lily couldn't sing or dance。