I couldn't get through.

电话打不通。

I'm feeling under the weather.

我觉得不舒服。

It's a matter of life and death.

事关生死。

After forty years teaching English he thinks it's time to call it a day.

他教英语四十年，认为该退休了。

Nothing gives me more pleasure than learning English.

再也没有什么比学英语更让我高兴的事了。

There is something in what she said.

她说的话里有些重要的内容。