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。 I also want some tea.
He has been to Beijing. I have also been there. He is good at English. He is also good at Japanese. 注：表强调时，also也可放在助动词或情态动词等之前。比较：I can also do it. = I also can do it.
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. He studies hard and I study hard, too. 3. either用于否定句，而且只能放在句末。 He didn’t know it. I didn’t know it either. I can’t speak French and can’t write it, either.
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。 She not only sings, she plays the piano as well. I can do it as well.
5. 在含有责备、抱怨或规劝之类句子中，若句子本身是以否定的形式表达肯定的意义时用“too”，而不用“either”。这类句子一般可用should, had better, would rather等改成肯定的形式，只是语气稍有不同。 Can’t you see I’ve got teeth, too？你难道看不出我也有牙齿吗？（＝You should see I’ve got teeth, too.） 6. 在表示建议或邀请的句子中，若句子是否定的形式，肯定的意义，用“too”而不用“either”。这类句子在大都可以改成肯定的形式。Won’t you come, too? 你也来吗？=Please come too.
Wouldn’t you have a cup of coffee too? 您也来杯咖啡好吗？（＝Please have a cup of coffee too.） 7. 在反意疑问句中，若主体句是肯定式，否定式的追加问句不影响整句的肯定意义，那么，主体句中可用“too”，而不可用“either”。
She went to see her last Sunday too, didn’t she? （＝Did she go to see her last Sunday too?） 8. 在具有否定意义的否定句中，否定词前可用“too”而不用“either”。但这类句子更常用“not…ether”结构来表达。He did not come, and she too did not come.（＝He did not come, and she did not come either.） I believed, too, that I had never listened so attentively. 我觉得我从来没有这么用心地听讲过。 9. too虽在否定词后，但否定词仅仅是否定某个词或片语，而不影响全句的肯定意义时，一般用“too”而不用“either”。 No worries and a comfortable place to sleep in are important, too. （1）also用于肯定句，一般放在be动词和助动词之后、行为动词之前。 We would also like to go to the movies.
also 比 too 和 as well 正式，有时为了强调也放在句末(但不常见)。
He also came. / He came also. She is young and beautiful，and also rich.
（2）too是个常用词，多用于口语，语气较随便。用于肯定句句尾，其前常用逗号分开。或作为插入语放在句中。例：I'm in Row 1，too．They are middle school students, too. She，too，is a singer． 在 Me too, You too 这类简略答语中，通常不用 as well, also。如：A：I’m tired. B：Me too. （3）as well用于肯定句，通常位于句尾，强调时可位于句中，通常不用逗号分开。
Tom is the captain of the football team, and is on baseball team as well. 也是棒球队员。
注：too, also, as well：都用于肯定句，表示前者怎样后者也怎样。三者可以作同义句转换。例如： You need to go shopping and I need to go shopping, too. =You need to go shopping and I also need to go shopping. =You need to go shopping and I need to go shopping as well. （4）either只用否定句中，置于句尾，且前面常有逗号分开。
If you don’t go, I won’t go, either. He doesn’t want any coffee, and I don’t want any, either. You don’t know the way and I don’t know it, either.
注意：有时在肯定句之后跟一个否定句，可能用too，also。
He came, but she didn’t also come. 他来了，但她没有也一起来。
He went to Washington, but not to New York too. 他去了华盛顿，但并不是也去了纽约。
练习 1．用too，also，either或as well填空：1）I'll go to see the film，_______．2）If you don't come here，I shouldn't，______． 3）I，______，will help him．4）Jack can speak Chinese，and his brother can ______ speak Chinese． 5）He knows Chinese _______． Keys: 1) too 2) either 3) too 4) also 5) as well
1. He is ______ saying, “I don’t want any bread, ______.” A. too, also B. also, too C. either, too D. also, either 2. I ______ study English and Russian. A. too B. also C. either D. as well
3. Not only the children but ______ their father is in town. A. too B. also C. either D. as well
4. John ______ believes that bears hibernate in winter ______. A. also, either B. too, as well C. also, as well D. as well, too 5. The foreigner can speak English, he can speak French ______. A. neither B. also C. either D. as well Keys：DBBCD
一、as well 用法：
1、as well常用作状语，作“又；也”解，相当于too或also，常位于句末，无须用逗号与句子分开。如： I am going to London and my sister is going as well（＝going，too）. 我要到伦敦去，我妹妹也要去。
I not only play the guitar，I sing as well（＝I also sing ）. 我不但弹吉他，而且还演唱。
2、as well 在口语中也可用于句中，作“也好，也行”或“倒不如”解，用来缓和语气。 You may as well go. 你去也好。
The weather was so bad that we might（just）as well have stayed at home. 天气太坏了，早知道如此，倒不如呆在家里为好。
3、as well 可以直接用于just后，用作应答语（可视为It's just as well、的省略），作“幸亏，幸而；无妨；没关系”解。
—We were too late to see the film. 我们去得太晚了，没有看上电影。
—Just as well, I hear it isn't very good. 不必遗憾，我听说电影也不怎么样。 二、as well as 用法
1、as well as常用来连接两个并列的成分，作“也，还”解。它强调的是前一项，后一项只是顺便提及。因此连接并列主语时，谓语动词与前一项一致；而用not only ...but also...连接时，谓语动词与后一项一致。
Your wife as well as you is friendly to me. 不仅你而且你的妻子也对我很友好。 （＝Not only you but also your wife is friendly to me、）
Electric energy can be changed into light energy as well as into sound energy. 电能既可以被转变成声能，又可以被转变成光能。 2、as well as 用来表示同级比较，指“一样好”。如：
You look as well as you did ten years ago. 你的身体看起来还和十年前一样好。 He plays the guitar as well as you. 他的吉他弹得和你一样好。 验收
1、They play all kinds of instruments and sing ____. A、also B、either C、as well D、as well as
2、Tom， ____ Jane and Rose， ____ going to the farm on foot.
A、as long as；is B、as well as；are C、as long as；are D、as well as；is 3、They travel at full speed by day ____ .
A、and night B、and by night as well as C、as well at night D、as well as by night 4、Mrs. Black writes ____，if not better than，her husband. A、as well as B、so well C、so well as D、as well
5、We expect her to do the housework as well ____ after the children. A. as look B. as looking C. and look D. looking
6、She doesn't speak ____ her friend，but her written work is excellent. A、as well as B、as often as C、so much D、as good as 7、Which of the following sentences is right？
A、Both father and as well as mother love me. B、Father as well as mother loves me.
C、Both father as well as mother loves me. D、Not only father but also mother love me. 8、You feel ____ you did yesterday，don't you？
A、as good as B、as well C、so good D、as well as
9、I'm sure I was right、It is just ____ I didn't lend him the money. A、so well B、as well as C、as well D、the same as Key: 1—5 C D D A A 6—9 A B D C
