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Present Tense: I am alive.
Past Tense: I was alive.
Future Tense: I will be alive.
"alive" is not a verb, it is an adjective, so the past/present/future tense is for the verb usually associated it.
Yes because you will always have memories. So they keep the past alive.
There was upto 80,00000000 in the past.
Early doesn't have a past tense. It's not a verb.