New King James Version
So they asked Him, saying, “Teacher, but when will these things be? And what sign will there be when these things are about to take place?”

King James Bible
And they asked him, saying, Master, but when shall these things be? and what sign will there be when these things shall come to pass?

American Standard Version
And they asked him, saying, Teacher, when therefore shall these things be? and what'shall be the sign when these things are about to come to pass?

Berean Study Bible
“Teacher,” they asked, “when will these things happen? And what will be the sign that they are about to take place?”

Douay-Rheims Bible
And they asked him, saying: Master, when shall these things be? and what shall be the sign when they shall begin to come to pass?

English Revised Version
And they asked him, saying, Master, when therefore shall these things be? and what shall be the sign when these things are about to come to pass?

World English Bible
They asked him, "Teacher, so when will these things be? What is the sign that these things are about to happen?"

Young's Literal Translation
And they questioned him, saying, 'Teacher, when, then, shall these things be? and what is the sign when these things may be about to happen?'

Luke 21:7 Additional Translations ...