简析also, too, as well和either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.