It's like a man going away: He leaves his house and puts his servants in charge, each with an assigned task, and tells the one at the door to keep watch.
NIV
It is like a man [already] going on a journey; when he leaves home, he puts his servants in charge, each with his particular task, and he gives orders to the doorkeeper to be constantly alert and on the watch.
AMP
For the Son of Man is as a man taking a far journey, who left his house, and gave authority to his servants, and to every man his work, and commanded the porter to watch.
KJV
Truly I tell you, this generation will certainly not pass away until all these things have happened.
NIV
Surely I say to you, this generation (the whole multitude of people living at that one time) positively will not perish or pass away before all these things take place.
AMP
Verily I say unto you, that this generation shall not pass, till all these things be done.
KJV
Many will come in my name, claiming, 'I am he,' and will deceive many.
NIV
Many will come in [appropriating to themselves] the name [of Messiah] which belongs to Me [basing their claims on the use of My name], saying, I am [He]! And they will mislead many.
AMP
For many shall come in my name, saying, I am Christ; and shall deceive many.
KJV