I have a sweet tooth.

我喜欢吃甜食。

What are you talking about?

你在说些什么？

If I had known that, I could have helped you.

假如我早知道，我就能帮你了。

He was always called as genius.

他总被人们称为“天才”。

If y ou lose your job I'll lose mine, so we're in the same boat.

如果你失去工作，我也会失去的，所以我们处境相同。

It is incredible that he should have gone to live in such a dangerous country.

他竟然搬到那样危险的国家去住，实在令人无法相信。