Example sentences of "[noun sg] is [vb pp] when [adj] [noun] " in BNC.

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1 A step-family is created when two adults form a new household in which one or both brings a child or children from a previous relationship .
2 Less tape is wasted when large files are used .
3 Winter will be a problem because the whole body of water will cool ( a pond has its base temperature protected by the earth ) so a heater is needed when freezing temperatures are expected .
4 The sleeper is awakened when rapid eye movements indicate that dreaming is taking place .
5 A stunning finale is created when panoramic views of the existing castle ruin are overlaid by specially commissioned paintings reconstructing the entire castle as it was 700 years ago .
6 But this argument is weakened when democratic arrangements break down and are not replaced by socialism , as has frequently occurred in industrializing countries .
7 Maximum efficiency is achieved when these factors are optimised in relation to each other .
8 Maximum efficiency is achieved when heavy soiling is loosened manually and chemically beforehand .
9 What extra significance is added when different items are put together ?
10 Holland Park , London and a private photographic shoot is disrupted when zealous fans find out what is going on .
11 The comparative is used when one object is compared with another separate object or group .
12 A ground-based winch then winds the loop and camera unit to which it is attached , up to the pulley if that is to be used as a trip or , as in most instances , remote control of the shutter is used when adequate height is achieved .
13 The situation is compounded when such behaviour is ‘ explained ’ by some of the completely non-psychological — indeed , even militantly anti-psychological — theories of crime and delinquency which are fashionable today with sociologists , social workers and the general public .
14 In Britain , it seems a recession is noted when national production goes down 1% : A recession in Japan is when the annual increase in production falls below 15% !
15 The second caveat is that even this amount of support is reduced when hypothetical compromises are put to the public .
16 A stage certificate is awarded when all aspects of a stage have been passed .
17 M paratuberculosis positivity is established when IS900-PCR results in the amplification of a 400 bp product .
18 It appears that alternative proposals — put forward by the RICS and others — may require developers to produce a statement on whether land is contaminated when any planning application is submitted .
19 An agreement is made when one person makes an offer to another and that other accepts it .
20 In addition , the procedure usually takes longer and an endoscope of a greater diameter is used when biliary stenting is performed .
21 One large external power filter is used when large clean-up jobs are required .
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