These are not conditionals, they're just connected/compound sentences. IMHO, #1 and #5 are wrong, #2 is notvery good (not sure if it's correct), #3 is ok Also: John regrets not havig helped me. He should have helped me, and he regrets not doing it / that he (didn't/haven't done) it.
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Ant_222MrP: Is #3 really wrong? Are all those hits that google gives in return to "regret not to have" phrase incorrect?Hello Ant,