在英语学习中 too，either，also 和一个词组 as well，它们都可以用来表示 “也” 的意思。但其用法不同：
1. too：具有肯定意义，当相邻的两个肯定句所叙述的事实相同时，后句末尾常用too表示“(后者)也……”。
too, 在句子中的位置，主要有两种情况。
(1) 放在句子末尾，可以用逗号隔开，也可以不用逗号隔开。如：
Tom is a teacher.His wife is a teacher, too. (用逗号隔开)
Tom is a teacher.His wife is a teacher too. (不用逗号隔开)
Tom 是一名老师。他的妻子也是一名老师。
I can speak French，too.
我也会说法语，
(2) 插入句子中。作为正式用语，too也会插入句子中间，但必须紧跟主语之后。作为插入语，通常用逗号隔开，但不能用在助动词或情态动词之后。如：
I, too, have been to Canada.（必须紧跟主语）
我也去过加拿大。
另外，too也用于固定搭配，多用于口语。如：
A: I am going home.
我要回家了。
B: Me too.(= So am I. / I am as well. I am also going home.)
我也是。
A: I like this song.
我喜欢这首歌。
B: Me too. / I like it too. (= So do I. / I do as well. I also like it.)
我也是。
通常不说：I too.(较正式) 或 me also.(无此用法) 或 me as well. (无此用法)
2. either：只用于否定句中，常用either表示“(后者)也(不)……”。只放在句子末尾，可以加逗号，也可以不加逗号。如：
Danny doesn't speak French.
Danny 不说法语。
Jenny doesn't speak French either.
Jenny 也不说法语。
I don't love fish. I don't love pizza either.
我不喜欢吃鱼。我也不喜欢披萨。
I didn't like the movie, either.
我也不喜欢这部电影。
3. also：含较庄重色彩，通常用于主要动词之前，但若主要动词是 be，则置于其后。如：
(1) 放在be动词之后。如：
I am also Canadian.
我也是加拿大人。
(2) 放在实义(行为)动词之前。如：
I also sing.
我也唱歌。
(3) 放在助动词、情态动词之后。如：
I can also speak French.
我也能说法语。
(4) 放在句首，用逗号隔开，表示强调。如：
It is a small house. Also, it needs a lot of repairs.
它是所小房子。它也需要大量的修缮。
4. as well：用于肯定句中，表示“也”的意思。用法与too基本相同，放在句子末尾。常用与口语。如：
Tom is a teacher. He teaches Chinese, and he teaches math too.
Tom teachesChinese, and he teaches math as well.
Tom teaches Chinese and he also teaches math.
Tom 是一名老师。他教语文，他也教数学。
练习1
用 also, too, either填空：
1. I don’t like cold climates. I don't think you like it _________ .
2. My friends aregoing to college next year. I am going to college next year _______ .
3. My wife is a diligent engineer. I am a diligent engineer _______ .
4. I love swimming. My son loves it __________ .
5. Today the weather isn't so good. It wasn't really good yesterday _________ .
6. I eat a lot more than an average person. My brother eats a lot _______ .
7. A bear can run very fast. A tiger runs very fast _________ .
8. I am not from Italy. My friend isn't from Italy __________ .
9. Paris is a big city. Madrid is a big city _________.
10. French is a difficult language to learn. Latin is a difficult language to learn _______
练习2：选择最佳答案
1. After learning the lesson above, you shouldn’t make such a mistake and he shouldn't _______ .
A. too B. as well C. either D. also
2. My friend Christian’s a very good cook; and he’s a very good athlete __________.
A. too B. as well C. either D. also
3. He didn’t thank me for the sumptuous meal, and you didn't ________ .
A. too B. as well C. either D. also
4. Sheila won’t tell you anything about her diet, and I won't ________ .
A. too B. as well C. either D. also
5. On holiday, fish was cheap, and potatoes were inexpensive ________ . The rest was unaffordable!
A. too B. also C. either D. and too
6. In a small restaurant, the forks weren’t clean, and the knives weren't _______ .
A. too B. as well C. either D. also
7. My friend spoke English and he spoke German as _________ .
A. and too B. as well C. either D. also
8. Their youngest daughter is a vegan _________ .
A. and too B. as well C. either D. also
9. The fruit crops are ________ good this year, I saw so many orchards.
A. also too B. as well C. either D. also
10. Not only children, but grown-ups ________ like climbing mountains.
A. also too B. as well C. either D. too
