no
1.用no或yes回答否定的疑问句，注意不可顺着那否定语而说yes，也不可否定那否定语而说no，如回答Is the baby not a boy不可说Yes, it is not a boy或No, it is a boy，却该说No, it is not a boy或Yes, it is a boy。换句话说，回答否定疑问句和回答肯定疑问句，那no和yes的用法是相同的。例如：
- Is the baby a boy?(肯定疑问句)
Yes, it is a boy.
No, it is not a boy. - Is the baby not a boy?(否定疑问句)
Yes, it is a boy.
No, it is not a boy.
但别以为用了no，后面一定有否定的词。如不论那疑问句是Is the baby a boy或Is the baby not a boy那答句都可以是No, it is a girl。it is a girl里并没有否定的词，但注意it is a girl却含有it is not a boy的意思。现在再举一个例子：
- Will he be at home this afternoon?（肯定疑问句）
- Will he not be at home this afternoon?（否定疑问句）
- No, he will be in his office.
回答Do you know those children? 当然该说Yes, I know them或No, I do not know them。但假使“只认识几个，并不全部认识”，那答语里用yes或no就要看后面怎样说。该说Yes, I know some of them或No, I do not know all of them。
2.下面每组里的两句意思不同：
- He has no more than twenty yuan(只有20元,可算少了)in hispocket.
He has not more than twenty yuan(至多20元,也许不满 20 元)in his pocket. - He has no less than twenty yuan(竟有20元,可算多了)in hispocket.
He has nor less than twenty yuan(至少20元,也许不止 20 元)inhis pocket. - Joe was no richer than his friend.(乔并不比他的朋友富些[两个都是穷人]。)
Joe was not richer than his friend.(乔并不比他的朋友更富[两个
都是富人]。)
3.下面每组里的两句意思不同：
- He is no fool.(他很精明。)
He is not a fool.(他不是呆子。) - He is no genius.(他是呆子。)
He is not a genius.(他不是天才。) - He is no grammarian.(他不大懂语法。)
He is not a grammarian.(他不是语法家。) - He is no scholar.(他不大识字。)
He is not ascholar.(他不是学者。) - He is no judge.(他不会鉴定。)
He is not ajudge.(他不是鉴定家。) - I am no angel.(我脾气不大好。)
I am not an angel.(我不是天使。) - It is no joke.(这是一件正经事。)
It is not ajoke.(这不是笑话。)
4.no such thing，no such book等表达方式里不可在such后面加上a。例如：There is no such thing (as that).
5.注意下面两句里的no前面没有a，the，his等词：
- He has no small reputation as an artist.
- He owes no small reputation as an artist to his paintings.
这种用法里的no是形容词（不是副词），修饰被形容词所修饰的名词，no small...=a great...。假使必须加a，the，his等词，最好把no改作not。例如：a not small reputation，the not small reputation和his not small reputation，但这三种表达方式不及a great reputation，the great reputation和his great reputation普通。
其他如Hers was no common talent和He is a person of no great height里的no的用法跟上面所说的相同。
上面说假使必须加a，the，his等词，最好把no改作not。事实上也有a no...，the no...，his no...等用法，如at a no distant date，the no small surprise of all和his no inconsiderable success，但很少见，最好不用。at a no distant date里的a删去，the no small surprise of all和his no inconsiderable success里的no改作not。
上面所举各例里的no后面的形容词都属于原级。用了属于最高级的形容词意思便大不相同。比较下面两句：
- He has no small chance of success.（他大有成功的可能。）
- He has no smallest chance of success.（他完全没有成功的可能。）
第二句=He has not the smallest chance of success.
6.no boy当然属于单数形式，no girl也是单数。no boy and no girl或no boy and girl也是单数。例如：No boy and (no) girl is admitted.
7.no one是“没有人”，no man也是“没有人”，但现在不普通，no one man是“没有一个单独的人”。比较下面三句：
- No one can do it.（没有人能够做这个。）
- No man can do it.（跟第一句相同，但不普通）
- No one man can do it.（没有人能够单独做这个［必须两个或更多的人才能够］。）
比较下面两句：
- No one knows all of it.（没有人知道这件事的全部［众人所知道的合并起来也许是全部，但也许不是全部］。）
- No one man knows all of it.（没有一个单独的人知道这件事的全部［众人所知道的合并起来才是全部］。）
8.no one of us，no one of these，no one of the books等表达方式也有人用，但不及用none普通。
9.no one（没有人）=no-one，参见no-one
10.不可说No book does not interest me，该改作Every book interests me。
11.No..., no...（要是你不…，就得不到…）和No...without...（你要…，总得…）意思相同，如No pains, no gains（要是你不劳苦，就得不到利益，就是“不劳则无获”）和No gains without pains（也是“不劳则无获”）。这种结构，在谚语里用得很多。例如：
- No mill, no meal.（不播种没收获。）
- No song, no supper.（不先唱歌没晚饭吃。）
- No sweet without sweat.（不劳则无获。）
- No rose without a thorn.（世上没有绝对的幸福。）
- No garden without its weeds.（有利必有弊。）
12.No...ing用在招贴、口号等里，表示“不准…”。例如：
- No smoking!（不准吸烟！）
- No scribbling on the blackboard!（黑板上不准涂写！）
- No talking!（不准讲话！）
- No parking!（不准停车！）
13.No pupil has really learnt to read if he does not know how to choose books这句意思很明白。就语法讲，he可说指no pupil，但不可用no pupil代he，可说指pupil，但也不可用the pupil代he。
14.下面B说No more he is而不说No more is he，因为he就是A所说的he，说No more is his brother而不说No more his brother is，因为his brother并不就是he：
A: I don't think he is clever.
B: No more he is. No more is his brother.
