能
too
也
句末,前面一般有逗号
肯定句,疑问句
also
也
通常位于谓语动词前面,助动词和情态动词后面；有时也可位于句首,其后用逗号隔开.
肯定句,疑问句
as well
也
句末,前面一般无逗号.
肯定句,疑问句
either
也（不）
句末
否定句,
否定疑问句
◇too 和as well通常用于肯定句或疑问句,不用于否定句,且通常放在句末.
I like you too /as well.我也喜欢你.
Are they coming too/ as well?他们也来吗?
He speaks English.But he knows French and German as well.他说英语,但他也懂法语和德语.
☆特别提醒：过去有一种说法,即 too前常用逗号与前句隔开,但现行牛津教材里too前无逗号也常见,即too前有无逗号
都可.as well前一般无逗号,too有时可以紧接在主语后面,但其前后都用逗号与句子隔开.该用法少见于初中教材,
了解即可.
I,too,will help you.
〖相关短语〗 Me too.我也一样.
----I want to eat an apple.----Me too.我想吃个苹果.我也想吃.
----I’m tired.----Me too.我累了.我也是.
◇also只用于肯定句和疑问句,位置在be动词和情态动词后,实意动词前.Lucy is listening to the radio,Lily is also listening.
Can he also swim?他也会游泳吗?
His wife went abroad last year and he will also go abroad.他妻子去年出国,他也要出国.
She is young and beautiful,and also rich.她年轻漂亮,而且有钱.
◇also 有时用于句首(其后通常有逗号),相当于连词 and.该用法在完形填空题型中多次出现.
Also,his mother was dead.再说,他母亲又过世了.
☆特别提醒：also与情态动词can连用,必须放在can的后面,相当多的初中生容易在此犯错.
I can also play the guitar.
◇either只用于否定句,且要放在句末.
I don’t know,either.我也不知道.
He hasn’t finished it,either.他也还没有做完.
I don’t watch TV,either.我也没看电视.
He won’t go,either.他也不会去.
☆特别提醒：在表示建议的否定句中,他的实际意义只是一种建议,并不表示真正的否定意义,所以只能用too,
而不用either.
Why not ask your brother to go to the cinema,too?为什么不叫你弟弟也去看电影?
◇also,too,as well在一定情况下可相互转换.
他既会说法语,也会说英语.
He speaks French,and English as well.
= He speaks French,and he speaks English,too.
= He speaks French,and he also speaks English.