This is a miracle attributed to the apostles in Acts chapter 2, after the Holy Spirit descended on the apostles like tongues of fire. How it came about is uncertain, since the entire eastern Mediterranean region spoke Greek, apart from the Palestinian Jews, and no one should have been especially surprised to hear the apostles speaking Greek.
Greek people speak Modern Greek.
The Greek people speak Greek. It is the official language of Greece and is also spoken by Greek communities around the world.
A person raised in Tarsus in the days of the Roman Empire would learn Greek language, culture, and philosophy. Unlike the other Apostles, St. Paul would feel totally at home in either Greek or Jewish culture. While the rest of the Apostles could speak Greek, The rest of them, with perhaps the exception of John, did not feel at ease in Greek culture.
Saint Andrew is traditionally believed to have spoken Greek, as he was from the Greek-speaking region of Galilee in Israel. He is considered one of the apostles of Jesus Christ.
The Holy Spirit came to the apostles on the day of Pentecost. He filled them and they began to speak in new tongues.
They speak Greek.
None of the apostles were Greeks. Paul specifically mentions that Titus was a Greek (Galatians 2:3), and Luke (the author of Acts and the gospel that bears his name) wasn't a Jew, but neither of them were apostles.
Greeks speak the Greek language.
The word "can't" is a contraction of "can not". So, "I can't speak Greek" = "I can not speak Greek".
Yes, many Greeks do speak english, although their official language is Greek.
The ancient Greek gods were believed to speak Greek, the language of the people who worshipped them. This is because Greek mythology and religious texts, such as the Homeric epics, were written in Greek.