Example sentences of "is [verb] but it [is] [adv] " in BNC.

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1 The expansion of forestry by means of a policy of attrition and isolation of farms is occurring but it is not necessarily a process which in the long term will lead to a reasonable balance of land use .
2 The value of T g depends on the way in which it is measured but it is also found to be a function of the polymer chain length .
3 It is running but it 's not showing us anything
4 In total , much more is known but it is less fully integrated .
5 If we have recently lost sleep ( after a week of trying to sleep in the daytime , for example ) or have been awake for an unusually long time , then the amount of deep sleep is increased but it is still concentrated in the earlier part of sleep .
6 A lot of people ask me if my hair is permed but it 's just naturally thick and curly .
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