", you are questioning (even if rhetorically) whether something is an eternal truth. Therefore, I would use the "past" tense (not a true past) in such cases.
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ortonRI thoughtSave yourself the mental angst of deciding. Always use the past (or past perfect if necessary) after I thought (that).
ortonRAnd what about "I didn't know + past/present tense "Yes. They sound right. However, the following also sound right:
I didn't know that two plus two is four.
I didn't know that water boils at 100 degrees.DoesDo they sound right ?
ortonRShouldn't it be "more than half thought ECT caused pain, nearly a quarter thought it caused brain damage"?It could be, but it doesn't have to be.
ortonRSome say that even in cases of eternal truth past tense should be used after "I thought +...."Who are these 'some'?
ortonRActually sir I have gone through the similar threads on almost every forum and there i found that mixed answers which really confused me.I suspect that is because you are trying to get an absolute rule - and there isn't one.