很长时间用英语怎么说

1. For a long time, I have been trying to master the art of cooking.

很长时间以来，我一直在努力掌握烹饪艺术。

2. He has been living in this city for a very long time.

他在这个城市已经生活了很长时间了。

3. It took me a long time to finish reading that book.

我花了很长时间才读完那本书。

4. I have been waiting for a very long time for this opportunity.

我已经等了很长时间这个机会。

5. She has been studying English for a long time, and now she speaks it fluently.

她学习英语已经很长时间了，现在她讲得很流利。