Example sentences of "this [be] [Wh adv] [noun] [noun sg] " in BNC.

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1 This is when scalp skin sheds excessively , leaving tiny flakes showing on hair and shoulders .
2 As previously explained , this is when keyboard input is expected .
3 This is when Beta Testing starts .
4 This is where neutron activation analysis enables us to source them with certainty .
5 There is no doubt that in the past this is where depreciation accounting has floundered , as an addition to the existing system : local taxes were judged to be incapable of bearing the additional burden .
6 This is where systems technology took over from the tools , and the change of emphasis may prove to have been programmed learning 's greatest gift to education .
7 This is where state visitor usually land , and official welcome by President Carter or to her senior US officials .
8 Oh , this is where desk plan
9 This is where family work could be useful helping the whole family to understand the part alcohol has come to play in the life of the vulnerable elderly person , the pattern of abuse , the defensiveness about it , and the likely outcome .
10 This is where employee involvement comes in .
11 This is where community work becomes crucial .
12 We 're now entering Dan 's house , this is where band practice was yesterday .
13 This is why Domesday Book does not refer to many churches which are known to have existed from other evidence .
14 This is why noise control should be taken into consideration at the design stage .
15 This is why food packaging products can only be 50% recycled .
16 This is why sound insulation should be taken into account when the building is designed : insulated breaks can be arranged to stop sound travelling , but this is n't possible after the structure is complete .
17 This is how Magdalen bridge looks today .
18 In domestic relationships within the household and in relationships between close neighbours , who see one another very frequently , this is how gift exchange usually operates .
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