also 一般用在肯定句中.too 用在肯定句和疑问句末.either 常用于否定句末. eg.He can sing,she can sing,too.他会唱歌,她也会唱歌. Do you like playing football,too?你也喜欢踢足球吗? He isn't a doctor,she isn't a doctor,either.他不是医生,她也不是医生. He can also swim .他也会游泳. He also asked to come here.他也要求到这儿来. He is also a student.他也是个学生.