14 Grk “They were astounded and amazed, saying.” The two imperfect verbs, ἐξίσταντο (existanto) and ἐθαύμαζον (ethaumazon), show both the surprise and the confusion on the part of the hearers. The verb ἐξίσταντο (from ἐξίστημι, existēmi) often implies an illogical perception or response ( ἐξίστημι): “to be so astonished as to almost fail to comprehend what one has experienced” (L&N 25.218).
15 Grk “Behold, aren’t all these.” The Greek word ἰδού (idou) at the beginning of this statement has not been translated because it has no exact English equivalent here, but adds interest and emphasis ( 1).

In other versions

And they were amazed and astonished, saying, “Are not all these who are speaking Galileans?

Utterly amazed, they asked: “Aren’t all these who are speaking Galileans?

They were astounded and amazed, saying, “Look, aren’t all these who are speaking Galileans?

They were completely amazed. “How can this be?” they exclaimed. “These people are all from Galilee,

And they were astounded and astonished, saying, “Behold, are not all these who are speaking Galileans?

And they were all amazed and marvelled, saying one to another, Behold, are not all these which speak Galilaeans?

Public Domain