en_tn/act/02/04.md

They were all filled with the Holy Spirit and

This can be stated in active form. Alternate translation: "The Holy Spirit filled all of those who were there and they" (See: rc://en/ta/man/jit/figs-activepassive)

speak in other tongues

They were speaking in languages that they did not already know.

to make declarations

Make formal, important speech, as opposed to everyday or unimportant speech.