Acts 2:4

And they were all filled with the Holy Spirit, and began to speak with other tongues, as the Spirit gave them utterance.

'OTHER TONGUES'-Which are defined as real human languages in the following verses (Acts 2:6-8). Even various translators can see this: 'in foreign tongues' (Mof); 'in foreign languages' (Gspd); 'in different languages' (Phi).

'GAVE THEM UTTERANCE'-'as the Spirit prompted their utterances' (TCNT); 'according as the Spirit gave them words to utter' (Wey).

Point to Note:

The speech was inspired, the words were being selected and chosen by God (2 Peter 1:20). Speaking in tongues was speaking by inspiration (expressing God's truth infallibly) in. foreign language that one had never previously studied. Vincent notes, 'A graphic imperfect; "kept giving" them the language and the appropriate words as the case required from time to time.' (p. 449)

'UTTERANCE'-669. apophtheggomai ap-of-theng'-om-ahee; from 575 and 5350; to enunciate plainly, i.e. declare: -say, speak forth, utterance.

-'A peculiar word, and purposely chosen to denote the clear, loud utterance under the miraculous impulse.' (Vincent p. 449)