TOO \ALSO \EITHER\ASWELL的用法

also, too, as well, either,作“也”讲，为副词。下面分别讲述：

一. too, also, as well：都用于肯定句，表示前者怎样后者也怎样。

too：一般放在句尾，可用逗号和前面的句子隔开，也可不用；

also：其位置大多放在be动词、助动词、情态动词之后，实义动词之前；

as well：其位置一般放在句尾，三者可以作同义句转换。例如：

You need to go shopping and I need to go shopping, too.

=You need to go shopping and I also need to go shopping.

=You need to go shopping and I need to go shopping as well.

二. either：用于否定句中，表示前者不……，后者也不……，其位置一般放在句尾。例如：

He doesn”t want any coffee, and I don”t want any, either.

You don”t know the way and I don”t know it, either.

too也（用于肯定句句尾，一般之前用逗号隔开）
I think so,too.

also还（置于主语后）
I also want to drink.（动词前）
I'm also thirsty.(be动词后)

either同too，但用于否定与疑问句
I don't think so,either.

as well用于句尾，作为词组，不同于as well as(与……一样好；和），这as well是“也\还是”的意思
I might as well want this CD.
That shirt is clean,as well.

too用在句子末尾，和前面要用