Example sentences of "[det] is when [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 pomposity and pedantry seem to get off the leash .
4 This is when time drops into bottom gear .
5 L3 increase markedly from mid-summer onwards and this is when disease appears .
6 This is when Beta Testing starts .
7 This is when disbelief actually suspended later .
8 There are some things you just keep your mouth shut about and one of those is when sex is n't much good .
9 That is when music , the voices of children , the kind tones of those who love us , must be very important .
10 Oh I 'm alright do n't worry about me I 'm , they , the person at home , their family must be told as well as you making a note in your accident book that there has been somebody with a knock on the head however mi minor it is , it 's got to be reported , because that knock could have repercussions , it could have broken a small vessel in the brain , it could still be bleeding and that is when compression takes over .
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