Hello Constance, you can use this in two situations.
Literally, when someone turns up exactly when you need them or ironically when they turn up at the worst possible time!
Hope this helps
Bob
December 9, 2016
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When you get someone to help or get someone else to give you, you have to say thank you.
December 9, 2016
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Constance
Language Skills
Chinese (Mandarin), Chinese (Other), English, Korean