think and know and similar verbs are very resistant to any attempts to violate the tense sequence "rule" that past must follow past. Burying the verb in a secondary clause ( what a l. f.
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CalifJimI used to think I knew (not know) what a logical fallacy was (or is).I realize that both are used, and probably considered correct, but I prefer is, because whatever it was, it still is (whatever it is now, it was then).
AvangiOf course, we wouldn't say, "Sorry, I thought you are John." Although whether or not he is John is not subject to change.
The question is, would we say, "Sorry, I thought I knew who you are."
My amateur explanation:
In your first sentence, the fact that you took that person for another man precludes you from using the
AvangiThe question is, would we say, "Sorry, I thought I knew who you are."We? Have you got a mouse in your pocket?