请问..这2句话怎麼翻译成英文呢?

This American speaks Chinese well enough to be understood (by all of us).
When they got to the railway station the train had left for ten minutes.

This American speaks Chinese well enough, that all of us can understand him.
When they reach the railway station, the train has already left for 10 minutes.

This American speaks Chinese so well that we can all understand.

When they arrived at the railway station , the train had left for 10 minutes .

This American speaks Chinese so well that we can understand him.
The train had left for 10 minutes when we arrived the train station.