john liao Which are correct? All are possible. Those which start with the present and end with the past perfect (3, 4, 7, 8) are a bit anomalous, but there may be scenarios in which they make sense.
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john liaoWhich are correct?All are possible. Those which start with the present and end with the past perfect (3, 4, 7, 8) are a bit anomalous, but there may be scenarios in which they make sense. The normal sequence of tenses is as you have them in 1, 2, 5, and 6 (past, past perfect).