Example sentences of "have combined to create " in BNC.

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1 Changes in social habits , which increase exposure of the pelvis to menstruum , and a new diagnostic technique may therefore have combined to create an increase in the incidence of endometriosis .
2 By the beginning of March , as many as 640 oil wells were alight and individual smoke plumes had combined to create a regional plume 1000–2000 km in length , extending frequently to the south-east and periodically to the north-east .
3 All of these features have combined to create the contemporary problem ; hooliganism exemplifies to perfection the difficulty of disentangling what is new from what is old in social history .
4 Since 1979 , a number of factors have combined to create a situation in the oil business which is the opposite of that in 1973 — a glut of oil on the world market and falling crude prices .
5 All of these features have combined to create the contemporary problem ; hooliganism exemplifies to perfection the difficulty of disentangling what is new from what is old in social history .
6 It took seven years to complete , but then that 's the secret behind the success story of this home where time and careful work have combined to create an elegant and colourful base for this busy family lifestyle .
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