I can't express myself very well in English.

我不能很好地用英语表达自己。

It'll come to me.

我会想起来的。

It's very annoying.

真烦人。

I envy you your health.

我羡慕你健康和身体。

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。