教你如何让肯定句变否定句、一般疑问句和特殊疑问句

例如：I play football.I don't play football.He plays football.He doesn't play football I played football.I didn't play football 如何变一般疑问句：（1）句子中有be,can,will的,把be ,can ,will 提前,I 通常...