Is the word "as" a preposition in the sentence "He ran as though his life depended on it"?

I'm 99% sure that it's not, due to the verb "depended". I just want to be 100% sure.


The word "as" is not a preposition. The combination "as though" is a conjunction.

American Heritage Dictionary "as though"
As if: looked as though they had been quarreling.

Merriam-Webster "as though"
as if

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