John promise his wife he_not smoke and he has never smoked ever since为什么要用would

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John promise his wife he_not smoke and he has never smoked ever since为什么要用would
John promise his wife he_not smoke and he has never smoked ever since为什么要用would

John promise his wife he_not smoke and he has never smoked ever since为什么要用would
该宾语从句前半部分使用虚拟语气情形,与说话时的现实情况相反;后半部门讲的是自那以后发生持续到现在的真实情况,所以用现在完成时