能
too
也
句末,前面一般有逗號
肯定句,疑問句
also
也
通常位于謂語動詞前面,助動詞和情態(tài)動詞后面；有時也可位于句首,其后用逗號隔開.
肯定句,疑問句
as well
也
句末,前面一般無逗號.
肯定句,疑問句
either
也（不）
句末
否定句,
否定疑問句
◇too 和as well通常用于肯定句或疑問句,不用于否定句,且通常放在句末.
I like you too /as well.我也喜歡你.
Are they coming too/ as well?他們也來嗎?
He speaks English.But he knows French and German as well.他說英語,但他也懂法語和德語.
☆特別提醒：過去有一種說法,即 too前常用逗號與前句隔開,但現(xiàn)行牛津教材里too前無逗號也常見,即too前有無逗號
都可.as well前一般無逗號,too有時可以緊接在主語后面,但其前后都用逗號與句子隔開.該用法少見于初中教材,
了解即可.
I,too,will help you.
〖相關短語〗 Me too.我也一樣.
----I want to eat an apple.----Me too.我想吃個蘋果.我也想吃.
----I’m tired.----Me too.我累了.我也是.
◇also只用于肯定句和疑問句,位置在be動詞和情態(tài)動詞后,實意動詞前.Lucy is listening to the radio,Lily is also listening.
Can he also swim?他也會游泳嗎?
His wife went abroad last year and he will also go abroad.他妻子去年出國,他也要出國.
She is young and beautiful,and also rich.她年輕漂亮,而且有錢.
◇also 有時用于句首(其后通常有逗號),相當于連詞 and.該用法在完形填空題型中多次出現(xiàn).
Also,his mother was dead.再說,他母親又過世了.
☆特別提醒：also與情態(tài)動詞can連用,必須放在can的后面,相當多的初中生容易在此犯錯.
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.他也還沒有做完.
I don’t watch TV,either.我也沒看電視.
He won’t go,either.他也不會去.
☆特別提醒：在表示建議的否定句中,他的實際意義只是一種建議,并不表示真正的否定意義,所以只能用too,
而不用either.
Why not ask your brother to go to the cinema,too?為什么不叫你弟弟也去看電影?
◇also,too,as well在一定情況下可相互轉(zhuǎn)換.
他既會說法語,也會說英語.
He speaks French,and English as well.
= He speaks French,and he speaks English,too.
= He speaks French,and he also speaks English.