since when

since when
1. (used in direct questions) 
Don't you know Emma is a vegetarian? - Is she? Since when?¿No sabes que Emma es vegetariana? - ¿Sí? ¿Desde cuándo?
2. (used in indirect questions) 
I asked since when they were married.Pregunté desde cuándo estaban casados.
3. (used in statements) 
The number of whales had dropped dramatically by the end of the nineties, since when they have slowly recovered.A finales de los noventa el número de ballenas había descendido drásticamente, desde entonces se han ido recuperando lentamente.
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