en_tn/act/21/37.md

As Paul was about to be brought

This can be stated in active form. Alternate translation: "As the soldiers were ready to bring Paul" (See: rc://en/ta/man/jit/figs-activepassive)

the fortress

This fortress was connected to the outer temple court. See how you translated this in Acts 21:34.

The captain said, "Do you know Greek?

The chief captain uses this questions to express surprise that Paul is not who he thought he was. Alternate translation: "So you know Greek." or "I didn't know you knew Greek." (See: rc://en/ta/man/jit/figs-rquestion)

know Greek

know how to speak and understand the Greek language