I can speak English改为否定句

I can speak English改为否定句 I think it's very difficult.改为否定句 I can speak English 改为一般疑问 I can speak English ahd Chinese.改为否定句是什么?并说出道理 Mary can speak English very well.改为否定句 He can speak both English and French.改为否定句 Both of my parents can speak English.改为否定句 she can speak English well 改为否定句 Both she and l can speak English改为否定句 The little boy can speak English 改为否定句 we can speak English改为否定句怎么说 Daming can speak good English.(改为否定句) The boy can speak English(改为否定句)