Example sentences of "[adv] difficult [verb] up [prep] " in BNC.

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1 He accepts it 's extremely difficult to come up with conclusive evidence that violent films cause violent behaviour , but that a series of studies in America 20 years ago suggested it was a factor .
2 Although his general health seemed more stable after his long recuperation , he was finding it more and more difficult to keep up with his daily obligations , let alone those of a more public nature .
3 Yeah it 's more difficult to keep up with others if they if they 're older and they 've been learning this stuff for a lot longer
4 It 's quite difficult to live up to that at school . ’
5 Royal women , too , even though quite ordinary in appearance , may be elevated in public opinion until they are considered to be the utmost in charm and elegance — again difficult to live up to , when they are continually ‘ on show ’ .
6 It is very difficult to come up with a sensible definition of what constitutes an ‘ old project ’ .
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