LINGUISTICS & CULTURE
|Data:||02/AGO/2013 10:43 PM|
You are asking for a point in time in the past.
Since John came home.
Since I was ten years old.
Since you gave me permission last week.
Since I finally accepted that nobody was going to help me.
You are asking for a unit of time.
For the last six months.
For two years.
For an hour.
However, the two forms are so similar that they are often used interchangeably.
Yes, "since when" is often used when expressing surprise OR sarcasm.
Since when have you been the boss of me? I have always been your boss.
(to be the boss of someone = to give orders to, be superior to, etc.)
Since when have you been dying your hair? For several years now.
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