no是形容詞,在句中作定語,表示否定,意思是沒有或不是,可以修飾可數(shù)名詞的單復(fù)數(shù)和不可數(shù)名詞,相當(dāng)于not a或not any,比如說：
see no reason,等于not see a reason,看不出任何理由.
There is no such disease. 等于There isn't such a disease,沒有這樣的疾病.
not是副詞,通常位于be動(dòng)詞、情態(tài)動(dòng)詞、助動(dòng)詞之后,構(gòu)成否定形式,意思是“不”,“沒有”,它也可以位于動(dòng)名詞、不定式、分詞（包括現(xiàn)在分詞、過去分詞）之前,構(gòu)成否定形式,意思同樣是“不”,“沒有”.在省略結(jié)構(gòu)里,not可以放在包括名詞、動(dòng)詞、形容詞、副詞等的一切詞類前面,表示否定,比如：
Tim isn't a young man.
He asked me not to be late.
Let's not go.
It seems not to be right.
Not having a vocabulary book is a serious problem.
Not having had anything for a whole day, he wolfed down three bowls of rice.
I need to have some meat because it has some minerals and vitamins not found in vegetables.
No, not tomorrow.
希望我能幫助你解疑釋惑.