too also as well either的区别：too作为副词，意为太、过于，用于形容词和副词前；also作为副词，意为而且、也，放在行为动词之前，特殊动词之后；as well意为也、还，常位于句末；either可作代词和副词，意为任何一个、要么要么，常用于否定句，且放句末。
一、too的基本含义及用法介绍
too作为副词，意为(用于形容词和副词前)太，过于，过度;也;又;还;(评说某事物使情况更糟)而且。
例句：He's far too young to go on his own.
他年纪太小，不能独自一人去。
Can I come too?
我也可以来吗？
She broke her leg last week─and on her birthday too!
她上星期把腿摔断了，而且还是在她生日那一天！
I'm not too sure if this is right.
这是否正确，我没有太大把握。
二、also的基本含义及用法介绍
also作为副词，意为而且;此外;也;同样。
例句：She was not only intelligent but also very musical.
她不仅聪明，而且极具音乐天分。
I didn't like it that much. Also, it was much too expensive.
我并不怎么喜欢它。再说它太贵了。
She's fluent in French and German. She also speaks a little Italian.
她的法语和德语讲得流利，也会说一点意大利语。
三、as well的基本含义及用法介绍
as well意为也、还。
例句：They sell books as well as newspapers.
他们既卖报也卖书。
The mind needs exercise as well as the body.
大脑同身体一样需要锻炼。
She doesn't play as well as her sister.
她演奏得不如她姐姐。
四、either的基本含义及用法介绍
1、作为代词，意为(两者中的)任何一个;(两者中的)每个，各方。
例句：You can park on either side of the street.
这条街两边都可停车。
The offices on either side were empty.
两边的办公室都是空的。
2、作为副词，意为(用于否定词组后)也;(补充时说)而且;(对两事物的选择)要么…要么，不是…就是，或者…或者。
例句：Pete can't go and I can't either.
皮特不能去，我也不能。
I know a good Italian restaurant. It's not far from here, either.
我知道一家很好的意大利餐馆，而且离这儿不远。
