Example sentences of "[adv] it become difficult " in BNC.
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1 | The sound of the water faded , there were only the two of them locked in this tiny space , and suddenly it became difficult to breathe . |
2 | But this enthusiasm swiftly evaporated and soon it became difficult to find anyone who was satisfied with it , let alone enthusiastic . |
3 | Later , the processes slow down with the shift to increased differentiation with a rapid fall in mitotic index in both embryo and fetal membranes after day 14 , thus it becomes difficult to obtain chromosome preparations from the later stages , particularly shortly preceding birth . |
4 | Characteristically it becomes difficult , but also necessary , in just this market phase , to distinguish this form of production from others with which it had analogous economic relations . |
5 | Then it becomes difficult to start . |
6 | A word of caution is required because if everyone is working on a sub-problem then it becomes difficult to tackle the whole problem in a novel way . |