Yes, although I'm sure that Jesus knew Greek as well as Aramaic and Hebrew. And you are right, sometimes we have to search the Aramaic for a really good look at what the Greek text and Jesus might have said. Most of the NT was actually written by Paul, a Roman citizen who became one of Jesus' disciples after His crucifixion and resurrection. Jesus appeared to St. Paul on the road to Damascus and Paul went from killing Christians to being a fervent believer and evangelist. Paul wrote what we call the epistles,or letters. The four Gospels are different, they are actually mini-biographies told from four perspectives.
Mandi