no是形容詞，可在句中作定語，表示否定，意思是沒有或不是，還能修飾可數(shù)名詞的單復(fù)數(shù)與不可數(shù)名詞，相當(dāng)于not a或not any。而not是副詞，通常位于be動詞、情態(tài)動詞、助動詞之后，它也可以位于動名詞、不定式、分詞(包括現(xiàn)在分詞、過去分詞)之前，成否定形式，意思是不、沒有。

There's no need for you to go.

你不必走。

That was by no means the end of the matter.

事情決不可能到此為止。

There are no significant differences between the two groups of students.

這兩組學(xué)生沒有明顯差別。

There's no difference in the results.

結(jié)果沒有差別。

There is no difference between the two in quantitative terms.

兩者在數(shù)量上毫無差別。

You should not go out in the heat of the day.

你不應(yīng)該在天最熱的時候外出。

Many people do not like the idea of experiments on animals.

許多人不贊成在動物身上做試驗。

We do not have any more information at the present time.

目前我們沒有進(jìn)一步的消息。

As you're aware, this is not a new problem.

正如你所了解的，這不是一個新問題。

Do it now please ─ not in three hours' time.

請現(xiàn)在就干，而不是三個小時之后。