Example sentences of "they [verb] [be] up to " in BNC.

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1 He had been let down several times , they had done all sorts of things without asking him , and sometimes he only found out what they 'd been up to when the papers rang for comment .
2 Researchers at Leicester University are monitoring 400 water sports enthusiasts , who they believe are up to three times more likely to suffer viral disorders than the rest of the population .
3 What they do is up to them and you should n't feel that you have to copy them .
4 I do n't know , if you 're like me but , I must confess , I I get er , I would n't say pleasure , but I rather like those incidents where he tells the disciples off , not because he 's telling them off , but because I can fit in wi with what they 've been up to !
5 They continued their research , but their reports were no longer published ( as they had been up to 1948 ) ; and , at a time when cost research was more clearly needed than ever before , Schiller 's team was starved of funds and talent .
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