Example sentences of "he must [be] [verb] at " in BNC.

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1 His face was in darkness , but he must be looking at her .
2 However , as she walked she felt he must be looking at her back as she walked away .
3 He must be working at something good . ’
4 He must be chuckling at his new image .
5 And Rozario looks in trouble at the moment he is just er limping around he 's sunk back to his er hands on his knees again and well look at that he you do n't really need words to describe how he must be feeling at the moment .
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