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I comprehend As Though/if can take the present and past tense. The problem is that sometimes I don't know what are the nuances among those 3. For instance:

He looks as if *he knows it"

He looks as if he knew it

He looks as if he'd known it

Also, when changing the main clause to the past, should I use

He looked as if he'd known it

He looked as if he knew it

Thanks in advance

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    You could replace He looks as if by some syntactic equivalent, such as All the available evidence gave me the impression that. Or simply remove it, since it makes no difference to the choice between 1: He knows it, 2: He knew it, and 3: He had known it. Do you understand the difference between those last three alternatives? – FumbleFingers Reinstate Monica Apr 8 at 17:15
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To illustrate the nuances, let's keep using the verb "to know", but change the rest of the example up a bit.

John often talks about Bill Gates as if he knows him personally.

John may or may not know Bill Gates, so this is a hypothetical statement about the present, from a present point of reference.

John often talks about my late grandfather as if he knew him personally.

My grandfather is no longer with us, so this is a hypothetical statement about the past, also from a present point of reference.

I'm not sure how to construct a hypothetical statement from a present point of reference using the past perfect tense. However, it's easy to modify the tense of the main clause in the above two examples:

John often talked about Bill Gates as if he knew him personally.

John often talked about my late grandfather as if he had known him personally.

The latter is a hypothetical statement from a past point of reference about something in the even further past (before the point of reference).

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