isnt的過去式

One moment he wasn't there, the next he was.

他一分鐘前還不在那裏，一會兒又在了。

She wasn't happy with our work and made us start over.

她對我們乾的'活兒不滿意，要我們返工。

It wasn't quite as simple as I thought it would be.

這事不完全像我想的那麼簡單。

Now look here, it wasn't my fault.

喂，那不是我的錯！

She didn't even call to say she wasn't coming.

她甚至沒打電話來説一聲她不來了。