as well,either,also,too的区别doc

as well, either, also, too的区别

1.also用于肯定句，既可表示两人干了同样的事，也可表示一个人干了两件事，通常位于be动词，助动词或情态动词之后，行为动词之前。

如：He has been to Beijing. I have also been there.他去过北京，我也去过。

He is good at English. He is also good at Japanese.他擅长英语，也擅长日语。

I also wants some tea.我也要点茶。

注意：表示强调时，also也可放在助动词或情态动词等之前。比较：

I can also do it.我也能干。

I also can do it.(同上)

2.too也用于肯定句，比also更通俗，和also, as well可以相互替换，可放在句中，也可放在句末。

如：Xiao Li went to Beijing and Xiao Zhao, too, went to Beijing.小李到北京去了，小赵也到北京去了。

He studies hard and I study hard, too.他学习用功，我（学习）也用功。

3.either用于否定句，而且只能放在句末。

如：He didn’t know it. I didn’t know it either.他不知道那件事，我也不知道。

I can’t speak French and can’t write it, either.我不会讲法语，也不会写法语。

4.as well在口语中用得很多，用法和too完全一样，可以互换，通常位于句末。

如：She not only sings, she plays the piano as well.她不但会唱歌，而且会弹钢琴。

I can do it as well.这事我也能做。