1. I don't find 'isn't it' natural in any of those sentences without 'that': A. Isn't it that f you tell the truth, you will have a peace of mind?
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Mister Micawber2. In B, can I also used "Wasn't it when...?" since the tenses of the verbs that follows are in the past?-- YesWhat is the difference in meaning if changed to 'wasn't"?