Example sentences of "is [adj] when [v-ing] a [noun sg] " in BNC.

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1 This is useful when telling a story , particularly as prostitutes appear in many ballets .
2 It is important when evaluating a belief to weed out of consideration any form of pretence or hypocrisy associated with the people claiming to hold the belief .
3 It is important when testing a cat 's hearing to ensure that you make the noise to check its reactions out of sight of the cat .
4 Cleanliness is important when making a pipe joint and the first stage with elderly pipes may be to remove rust , old paint and congealed jointing compound .
5 It is essential when screwing a mirror to a wall that the wall is flat , and there should be a gap of around 3mm behind the mirror to allow it to ‘ breathe ’ .
6 Cleanliness is essential when carrying a food product like sugar .
7 Paving slabs can be laid with right angled corners , or in staggered patterns , but this is difficult when bordering a lawn , for instance
8 In nature they are found living singly , in pairs , or in small groups depending on the size of the host and are happy in the aquarium whichever of these alternatives you adopt , although it is wise when keeping a number together to restrict these to one species , as most clownfish species are mutually intolerant of other species of their family and will not share living space or an anemone host .
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