Example sentences of "[verb] [adv] have [verb] back [prep] " in BNC.

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1 But we do not have to go back to prehistoric times to witness the change in our diet .
2 They probably did n't have to refer back to their superiors-those mysterious Controllers , be they human or not — for instructions , they probably had their contingency plans all ready and prepared .
3 The home environment is private , you do n't have to drive back from the vets when you are upset and your pet is likely to be more relaxed because his is in familiar surroundings with the people he loves .
4 DEC ) is a valid formula ; you do n't have to refer back to cells on the worksheet to understand it .
5 You do n't have to go back to Gibraltar .
6 You do n't have to rush back to work , do you ? ’
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