also，too這兩個詞都是副詞，又都表示“也是”的意思，但在修辭意味和使用場合上有所不同。它們的`區別如下：
(一)一般說來，also用於比較正式formal)的場合，語氣比too莊重; too是慣熟familiar)的用語，使用範圍較廣。
(二)also在句中的位置要緊靠動詞; too在句中的位置比較靈活，有時插入句中，前後用逗號分開，有時放在句末。
(三)too只能用在肯定句中，不可用於否定句內。在否定句中，只能用either;also則可以用在否定句中。
下面請看例句：
The Hong Kong Chief Executive also heads the university as Chancellor.
Reading books is learning，but application is also learning and the more important form of learning.
讀書是學習，買踐也是學習，而且是更重要的學習。
We have not heard such a ，we have never seen such a scene.
我們沒有聽見過這種事情，我們也從來沒有見過這種場面。
請注意，一般說來，also在句中的位置應緊靠動詞，但有時為了強調其意，也可以將它放在句首或句末。
Here，too，the colon must be followed by a dash.
這裡也一樣，應當在冒號之後加破折號。
Mary，too，can play the piano.
瑪麗也會彈鋼琴。
Could you speak Japanese?—Yes，and Spanish too.
您會說日語嗎?——會的，還會說西班牙語哩。
Also雖然和too同義，但前者大都用於書面語，後者大都用於口語。例：
The lady washed the children and also gave them dinner.書面語)
The lady washed the children and gave them dinner too.口語)
在口語中，too還可以用 as well代替。
有時候，also在句中的位置不同，句子的涵義也會跟著變化。例：
John is also concerned in this matter.(1)
John also is concerned in this matter.(2)
John is concerned in this matter also.(3)
(1)句的涵義是：John is concerned in this matter as well as that one.
(2)句的涵義是：John is concerned in this matter，just as somebody else is.
(3)句的涵義是：This matter is the last of many that have been mentioned.
