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
9 december 2016
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When you get someone to help or get someone else to give you, you have to say thank you.
9 december 2016
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!