deepuji Simple past or Present perfect with today Simple past is almost always better. Also, "today" doesn't often occur at the beginning of a sentence, so in 3 and 4 I'd move it to the end to make it sound more natural. Actually I should say "in 4" because 3 doesn't work anyway.
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deepuji Simple past or Present perfect with todaySimple past is almost always better.
deepujiCould you please tell me in what circumstances do we use and 1. If you have met him today, then you must consider yourself lucky.2. If you met him today, then you must consider yourself lucky.Both are possible in the same circumstances. If it's still "today", you can use either one. But I think that's obvious.
deepujiCould the difference between them beI think the first one would mean that there is still a possibility of meeting him, whereas in the second one there is none.That might be a slight difference in some contexts, but I think the "if" tends to cancel that difference in the given sentence.
deepujiI have not seen John this week. ... I didn't see John this week. ... I saw John this week. ... I have seen John this week.You are digging way too deep. I don't know what is causing you to suffer such angst over this matter. There is nothing to prevent your seeing John again this week no matter which of these you use. These statements do not ad