Example sentences of "difficult [to-vb] and [is] " in BNC.
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1 | If there is infestation of the eyelashes or eyebrows , there may be a marked blepharitis , inflammation around the eye , which can be difficult to diagnose and is resistant to treatment until the correct diagnosis is made . |
2 | The feeling of comfort is basic to a sense of well-being , but it is difficult to define and is often most notable in its absence . |
3 | Staff time taken with such enquiries is difficult to evaluate and is probably underestimated in many Job Descriptions in Annual Staff Reports . |
4 | The proportion of the different grains present is more difficult to ascertain and is done using two main techniques , point counting and visual estimates . |
5 | As Gunn states , this situation is difficult to achieve and is probably undesirable . |
6 | Although Barraclough 's ( 1972 ) suggestion that as many as a fifth of the suicides in a series he studied might have been prevented by the wider use of lithium would be difficult to substantiate and is probably an overestimate , the fact that the lives of as many as 16 per cent of patients with manic-depressive illness may end in suicide ( Pitts and Winokur 1964 ) suggests that lithium is likely to have an important role in the prevention of suicide in some patients . |