Example sentences of "[is] [that] they [was/were] [verb] " in BNC.

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1 The most dramatic feature about the genes mutated so as to cause muscular dystrophy and cystic fibrosis , however , is that they were discovered by reverse genetics — neither dystrophin nor cystic fibrosis transmembrane receptor were known to exist in the body before they were discovered by Kunkel and Tsui respectively .
2 This shows that one of the major factors that distinguishes the films of motorways and bends in roads from those of junctions is that they were rated as having less to see in them .
3 He also commented : ‘ It must be wondered why so many different guides have been produced , with so much duplication of effort , particularly when the overall impression is that they were prepared within libraries without reference to the needs of readers and without consultation or collaboration with the subject teachers . ’
4 The defence of the format of these books is that they were written as part of a struggle .
5 What all three things have in common is that they were caused by autumn .
6 In consequence , it has been claimed that the buildings were seldom used , but a more likely explanation is that they were kept scrupulously clean for official travellers .
7 They are mentioned by name on eighteenth-century maps and referred to in Sir Walter Scott 's The Bridal of Triermain ; they are often supposed to mark the county boundary , which they do not , and the most popular theory is that they were erected at the time of the Border raids to delude Scots advancing up the Eden valley , from which they are conspicuously in view , into the belief that an English army was encamped there .
8 One theory is that they were carried by ice sheets .
9 Another suggestion is that they were put there by shepherds so that they could find their way off the fell in bad weather , the idea being that by the number of cairns the shepherds would be able to tell where they were and by the pattern they could know which direction to follow .
10 ‘ Well , the only conclusion is that they were lured to their deaths .
11 ( p. 253 ) Instead , the major complaint is that they were forced to give up political activity after the struggle .
12 One theory is that they were stolen by experts with an order already in mind .
13 All I know is that they were delivered . ’
14 The key to this paradox is that they were talking about different kinds of capitalists .
15 One favourite story is that they were brought there from Japan by Phoenician traders thousands of years ago .
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