not的過去式

not的釋義：

adv.(否定後面的詞或短語，或作否定的回答)不;(構成動詞be、do和have及情態動詞can或must等的否定形式，常縮略為n't)沒有

例句：

The problem is not primarily a financial one.

這個問題基本上不是財政問題。

This will not be possible in the changed economic climate.

這在經濟氣候已經改變的'條件下是不可能的。

It was not a propitious time to start a new business.

那不是營業開張的吉時佳日。

It would be preferable to employ two people, not one.

僱請兩個人比僱請一個更好。

The results of the experiment are not statistically significant.

從統計學的觀點看，實驗結果意義不明顯。