I have two questions:
Q1: Which one(s) of the sentences below, can be grammatically correct and why?
And if there are more than one correct sentence, does the meaning change when the verb tense is changed or are they synonymous and can be used interchangeably?
1- Yes, I was. I've never known until he had appeared on TV.
2- Yes, I was. I've never known until he appeared on TV.
3- Yes, I was. I've never known until he has appeared on TV.
4- Yes, I was. I've never known until he was appearing on TV.
Q2: What if the choices above are answers to this question below, are the answers to Q1 the same to Q2?
So in 2003, when you said you didn't know, were you telling the truth at that time?