am is are后面加什么

　　If you need anything, I am at your service.

　　您要是需要什么，請盡管吩咐。

　　Am I right in thinking that you used to live here?

　　我想你過去在這里住過，對嗎？

　　The system was state of the art.

　　這一系統是當時最先進的。

　　We are still friends, though, which is good.

　　不過我們仍然是朋友，這令人感到欣慰。

　　There have been many changes in recent years.

　　近幾年發生了許多變化。

　　In our company, quality is high on the agenda.

　　我們公司高度重視質量。