Jesus answered is literally “Jesus answered and said to them.” The redundancy once again reflects Semitic structure.

One miracle is literally “one work” Jerusalem Bible (Revised Standard Version “one deed”), evidently a reference to the miracle recorded in 5.1-9. John uses both “signs” and “works” to describe the miracles of Jesus; Good News Translation makes it explicit that the reference is to a miracle. New English Bible suggests a wrong focus, “Once only have I done work on the Sabbath,” intimating “one day of work” instead of one mighty miracle.

You were all surprised translates the same verb used in verse 15.

Quoted with permission from Newman, Barclay M. and Nida, Eugene A. A Handbook on the Gospel of John. (UBS Handbook Series). New York: UBS, 1980. For this and other handbooks for translators see here .