This is a paraphrasing task. In this task, you're given a sentence and your task is to generate another sentence which express same meaning as the input using different words.

we must return to the palace at once ! -
we have to go back to the palace .

okay , so , this is the truck we 're thinking of buying .
we were considering buying this van .

if this is what the doctor 's doing to you ... ... do n't you think it 's time i had a talk with him ?
if this doctor is doing this , do n't you think it 's time for me to talk to him ?