con·di·tion·alBrE/kənˈdɪʃənl/NAmE/kənˈdɪʃənl/noun(grammar语法) [C]asentenceorclausethatbeginswithiforunlessandexpressesacondition条件句,条件从句(由 if 或 unless 引导的)the conditional[sing.]theformofaverbthatexpressesaconditionalaction, forexampleshouldinIfIshoulddie…动词的条件式(如 should 用在 If I should die...)◆thepresent/past/perfectconditional现在/过去/完成条件式◆thefirst/second/thirdconditional第一/第二/第三条件式