is not的縮寫形式

例句;

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

正如你所瞭解的'，這不是一個新問題。

2、The painting is not representative of his work of the period.

這幅畫不是他在那個時期的代表作。

3、 It is not within my power to help you.

我是愛莫能助啊。

4、It is not clear what they want us to do.

我們不肯定他們要我們做什麼。

5、Her work is not up to standard.

她的工作不合格。