If it wasn't for Amber he wouldn't be able to marry Claire.
Please, what does "it" in this sentence refer to?
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The pronoun "it" refers to the actions of Amber. Some linguists would call that a dummy pronoun. Informally it can be unrolled like this:
If it wasn't =
If it was not =
...and means much the same as:
Without Amber he wouldn't be able to marry Claire.
But "if it wasn't" is a shade different, in that it gives more emphasis to chance, rather than just stating a logical necessity. Example:
Without eggs we can't make meringue. (necessity)
If it wasn't for pick-pockets I'd have no sex life at all. - Rodney Dangerfield (chance)