Example sentences of "[conj] [pron] [vb base] it must [verb] " in BNC.

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1 well I mean the heart 's the most obvious organ , but I mean it must put a strain on everything else
2 I ca n't be sure what my face looked like when I opened it and saw Maureen on the doorstep , but I imagine it must have had a grin on it from ear to ear .
3 I can not know how she feels about that experience , but I think it must have been reassuring rather than distressing .
4 But I guess it must have worked …
5 I can not remember whether it soared off into space from time to time , though I guess it must have .
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