Example sentences of "you must use a [noun sg] " in BNC.

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1 You must use a double-check valve on the hose supply to prevent the risk of back-siphonage contaminating the mains water supply if you use this technique .
2 If you must use a painting program then it is essential to use one that works at the resolution of the output device .
3 It 's probably unrealistic to expect you to avoid the sun altogether on holiday , but you must use a sunscreen with a factor of at least 15 and not go any lower .
4 To do that you must use a variety of clubs for chipping , from the sand wedge to the 5 or 4-iron .
5 If you must use a rim lock , buy the best rim deadlock you can afford , and fit it with long and strong screws .
6 If you must use a light to illuminate your indicators then make it a dull , red one .
7 But , with yourselves , do make sure you cleanse properly I 'm not too worried about your toner , but you must use a moisturizer , just to make sure that your skin is nice and soft and supple .
8 If you must use a stranger , make sure you get several references and check them carefully .
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