一、辨析
1、both兩者。如：
I like them both.
我喜歡他們兩個。
2、either也（不）。用於否定句中。如：
I don’t like fishing, David doesn’t like fishing, either.
我不喜歡釣魚，大衛也不喜歡。
3、neither也不。用於肯定句，表示否定含義。如：
He can’t swim, and neither / nor can I.
他不會遊泳，我也不會。
二、運用
1、both… and…表示肯定概念；neither… nor…表示否定概念。如：
Both he and I are right.
我和他都對。
Neither he nor I am right.
我和他都不對。
2、either用於否定句與neither（nor）用於肯定句意思相同。有時，含有either與neither（nor）的句子可用neither… nor…來改寫。如：
Jim doesn’t like football.
Tom doesn’t like football, either.
=Jim doesn’t like football. Neither (nor)does Tom.
=Neither Jim nor Tom likes football.
吉姆和湯姆都不喜歡足球。
either… or…在否定句中意為「既不……也不……」，同neither… nor…。如：
He can’t speak either English or Chinese.
=He can speak neither English nor Chinese.
他既不會說英語，也不會說漢語。
3、both用於否定句時是半否定，在全否定時用not either或neither。如：
I don’t know both his teachers.
他的兩位老師我並非都認識。（半否定）
I know neither his teachers.
=I don’t know his teachers either.
他的老師我都不認識。（全否定）
4、both… and…, too, so用於肯定句與neither … nor…, either, neither (nor)是相反的。如：
Susan likes playing the violin.
Shirley likes playing it, too.
=Susan likes playing the violin, so does Shirley.
=Both Susan and Shirley like playing the violin.
蘇珊和雪莉都喜歡拉小提琴。
練習：
1. —Can I park my car here?
—Yes, you can park on ____________________ side of the street.
A. either
B. neither
C. both
D. all
2. We asked John and Henry some easy questions, but ____________________ of them could answer them.
A. none
B. both
C. all
D. neither
3. —Which is more useful, biology or chemistry?
—I think ___________________ them are useful.
A. either of
B. none of
C. both of
D. all of
4. ___________ Lily ______________ Lucy may go with you because one of them must stay at home.
A. Not only; but also
B. Neither; nor
C. Both; and
D. Either; or
答案：
1.A 2.D 3.C 4.D
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