1．No（没有）是形容词,常位于名词前,用来否定这个名词.有时no否定名词时,可理解为这个名词的反义词,意思是“并非”.
（1） no ink has left没有墨水了.不可说：not ink has left
（2）no clouds can be seen．天上没有云.
（3） no fool＝ clever精明.比较not a fool不是傻子.
no good = 很不好 (和好完全不沾边) not good = 不好(单纯的否定)
比较 No fool as he is,he can work out difficult math questions 他聪明,所以能解数学难题
Not fool as he is,he can do what others do 他不傻.所以别人能做的他也能.
当他们修饰数量或者范围时no 的否定式全否 ,no one understands me 没有一个人理解我
not 是部分否定,not all ,not everyone 不是全部的,不是所有的 not everyone can do it 不是所有人都能做到.
但是他们也有表示同一意义的时候 比如 no person =not a person 或者not any person
no person is in
not a (或any)person is in
最后就是no not 接比较级的区别:
not more … than = 不如……
no more … than = 和……一样不(否定两者)
not less … than = 不如……不（即指不如 less 后形容词的反面）
no less … than = 和……一样(肯定两者)
比较以下各句的意思：
You are more careful than he is.你比他仔细.
You are not more careful than he is.你不如他仔细.
You are no more careful than he is.你和他一样不仔细.
You are less careful than he is.你不如他仔细（你比他粗心）.
You are not less careful than he is.你比他仔细（你不如他粗心）.
You are no less careful than he is.你和他一样仔细.