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Definitions from the Web

Since When

Part of speech: Adverb phrase

Sense: Used to question the starting point or time of an event, action, or situation.

Usage:

1. Interrogative: Since when did she start playing the guitar?
2. Rhetorical: Since when does he get to dictate how we run our business?

Sample sentences:

• Since when did you become an expert in coding?
• Since when has she been interested in astronomy?
• I've known him for years, so since when he has a fear of heights?
• Since when is wearing a hat indoors considered disrespectful?

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