Example sentences of "[be] at it [prep] [adj] " in BNC.

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1 ‘ If you think someone can work at his best at half past two in the morning after being at it since eight the day before you know nothing about human beings .
2 When they had killed three sheep and roasted them in the middle of the street and ridden off with the rest of the flock , and the cattle and the horses and the hens , we buried the dead — we were at it for most of a day — and then we went off east into Arkaig .
3 You know and to talk about many other , while they were at it with this questionnaire , they tackled many other subjects as well you know .
4 But I 've been at it for 15 years .
5 We had been at it for three months now .
6 We 've been at it since six . ’
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