In your question it is subjunctive. You are not a Brit but sound like one. I can't explain why.
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IvanhrHow can you tell which form is meant?You can't.
IvanhrIf we can't ,does it mean that sentences like that are inherently ambiguousYou could say that. Most native speakers don't sense a great deal of difference between the two after "as if". There is no grammatical requirement for one form or the other. were