I don't know about that!

我不知道那件事！

I'm not sure about that.

我不确定。

You mustn't worry about that.

你不必担心那个。

How about that new ride over there?

那边的新游乐设施怎么样？

My parents want me to be a doctor, but I'm not sure about that.

我父母想让我成为医生，但我不确定。

Pah, who cares about that?

呸，谁在乎那个？

Uh, I'm not sure about that.

呃，我不太确定。

Uhm, I'm not sure about that.

呃，我不太确定。

Umu, are you sure about that?

“嗯，你确定吗？”

She is gaga about that new TV show.

她对那部新电视剧狂热的。