also too as well either neither 意思 区别

also,too 和 either
also表示"也"是比较正式的用词,too 是普通用词,口语中用的多,使用时
应注意:
also 一般用于句子中,其位置在行为动词之前,动词to be之后.如有
助动词或情态动词,一般应在助动词或情态动词后,为了强调,也可
放在前面.例如：
*I also went.
我也去了.
*You are also wrong.
你也错了.
too常置于句末,前面可用逗号,如置于句中,其前后均有逗号.例如
*He is a singer ,too.
他也是歌唱家.
*He,too,is a singer.
注意:also,too只能用于肯定句.
either neither
either 表示“也”,只能用在否定句中,必须放在句末.例如：
*He didn''t go there.I didn''t either.
你不去那里,我也不去那里.
neither表示"两者都不".
Eg.In neither case can I agree.
两种情形我都不能同意.
Eg.Neither of them wants to stop for a rest．
他们俩人谁也不愿意停下来休息.
as well as 作并列连词相当于not only…but also和no less…than,但not only…but also侧重在后项,as well as 和no less…than 侧重在前项.例如：
We must learn to look at problems all-sidedly,seeing the reverse as well as the obverse side or things.
A true man should be practical as well as far-sighted.
在否定句中,as well as 的位置不同,句意往往有很大差别.比较下面的句子：
He,as well as she,will not come.他将不来,她也将不来.
He will not come as well as she.她将来,但他将不来.（否定前者,肯定后者）
Henry,as well as his brother,doesn''t work hard.亨利同他弟弟一样,工作不努力.
Henry doesn''t work hard as well as him brother.亨利工作不努力,但他弟弟努力.
as well as 连接的应是平等成分,都作主语或都作宾语等.例如：
She was there as well as me.（误）
She was there as well as I .（正）