) 'Since' is a preposition there. rpsh What the attribution of 'as' here? 'As' = which.
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rpshFor the conjunction 'since' at the sentence-initial position, I consider it should not be a conjunction.)'Since' is a preposition there.
rpshWhat the attribution of 'as' here?'As' = which.
rpshSince the stroke, he has calmed down a bit, as tends to happen with those sorts of things,..."as" is a conjunction here, and the dummy subject "it" is implied (as (it) tends to happen...).