see no reason，等於not see a reason，看不出任何理由。
There is no such disease. 等於There isn't such a disease，沒有這樣的疾病。
not是副詞，通常位於be動詞、情態動詞、助動詞之後，構成否定形式，意思是“不”，“沒有”，它也可以位於動名詞、不定式、分詞（包括現在分詞、過去分詞）之前，構成否定形式，意思同樣是“不”，“沒有”。在省略結構裏，not可以放在包括名詞、動詞、形容詞、副詞等的壹切詞類前面，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.
希望我能幫助妳解疑釋惑。