1] I met her at then . (This "then" indicates a time in the past) Fine 2] I will meet her at then . (This "then" indicates the promised time in the future) Fine [3]Can I replace " at that time" for " then" in both sentences?
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Son JamesMr.FivejedjonI appreciate that you wish to be polite, but there is no need for the 'Mr'. I am just fivejedjon.