Example sentences of "them difficult [verb] " in BNC.

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1 The young parr which hatch out are dull-coloured , making them difficult to see in their freshwater home .
2 She dyed some of the rice grains a different colour from the background , these grains were easy to see : she dyed other grains the same colour as the background , which made them difficult to see .
3 The nature of black holes makes them difficult to detect ; all we may ever have is indirect evidence for their existence .
4 Do choose bottles that have no indentations inside that might make them difficult to clean thoroughly .
5 But where they address discourses of ‘ race ’ , sexuality , age , and class among subjects , they seem to find them difficult to deal with on their own terms .
6 They see themselves as special , and their search for challenge , novelty and change , their intolerance of errors in the work of others and their aversion to formal controls make them difficult to manage .
7 It also makes them difficult to control .
8 A comment was made that the idiosyncrasies of each library made them difficult to use .
9 Figure 6.3 Many species of birds give alarm calls when they see a dangerous predator The particular bird giving the alarm call runs the risk of attracting the predator to itself , so the alarm calls have acoustic properties which make them difficult to locate .
10 Many birds give alarm calls to warn of danger , but it is not certain whether the acoustic properties of the alarm calls make them difficult to locate .
11 At the same time , the three thousand five hundred tanks and three hundred and ninety thousand Iraqi troops have dug into defensive positions which make them difficult to knock out , even with the sophistication of British and United States ground attack bombers .
12 tiles are generally stuck in place with a contact adhesive , which makes them difficult to remove if you want to change to another floorcovering .
13 This can make them difficult to remove from detectors with individual ‘ drop in ’ battery compartments .
14 Despite the great volume of material that existed on the Mughals , I had always found them difficult to visualize .
15 The fine analysis of the DH sites upstream of the Ea gene has been hampered by the presence of repetitive/unstable sequences making them difficult to subclone , and thereby reduce the upstream regions to an absolute minimum as in the β-Globin LCR studies ( 14 ) .
16 Most of the many suggested grids bear little relation to each other , and their generalized nature makes them difficult to apply to practical Earth Mysteries .
17 Some computer programs are marketed in a form that makes them difficult to copy .
18 Other speakers seemed to be relatively exposed to standardizing mainstream influences , in that they had contracted few personal ties which were likely to exert normative pressure on their behaviour ; but in any case the geographical spread of the ties contracted by most Braniel speakers made them difficult to investigate .
19 Does this make them difficult to follow ?
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