Example sentences of "[verb] and [Wh adv] [verb] they [vb infin] " in BNC.

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1 grow and when do they flower ?
2 When do prepayments arise and how do they differ from accruals ?
3 All invite two questions : why do animals migrate and how do they know the way ?
4 What function do they serve and how do they help the zebra to survive ?
5 A brief comparison of British and American assemblies demonstrates the importance of the question : who or what do representatives represent and how do they set about it ?
6 How is health policy decided , what forms do health services take and how do they relate to people 's wishes and needs ?
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