I wanted to know if "since + clause" was an adverbial clause or noun clause in the phrase or after the phrase "it's been a while since I've seen you.".
I was thinking “it's been … since” might be like an adposition or a preposition or a circumposition
And maybe the phrase “it's been … since” might be like or mean “ago” or “before”.
Is “it's been … since” a phrase?
What might you think ?