too,also,either的用法

too和also一般都用于肯定句,too放在句尾,通常用句号隔开,also放在实义动词前,联系动词后.例：He runs fast,too.=He also runs fast. I'm a student,too.=I'm also a student. either主要用于否定句,放在句尾,通常用...