在这种条件句中,结果主句常用直陈语气或祈使语气。如:
(17)If the train should be late, what will you do? 如果火车晚点了,你将怎么办?(结果主句用疑问句)
(18)If we should fall in this, we are ruined. 我们这个计划如果失败,我们就倒霉了。(结果主句用直陈语气)
(19)If you should meet Henry, tell him I want to see him. 假如你见着亨利,告诉他我要见他。(结果主句用祈使语气)
关于过去式、should+动词原形与were to+动词原形这三种虚拟式的可能性孰大孰小的问题,语法家们认为它们的可能性虽都不大,但相比较,were to+动词原形的可能性最小,should+动词原形次之,过去式更次之。试比较:
(20)If the ship left at noon, it would pass through the canal between 2 and 2:30 p.m. 这艘船如果中午启航,下午2时至2时半之间将穿过运河。(有可能,但不大)
(21)If the ship should leave at noon, it would pass through the canal between 2 and 2:30 p.m. (可能性较上例小)
(22)If the ship were to leave at noon, it would pass through the canal between 2 and 2:30 p.m. (可能性最小)
[注]虚拟过去式有时并不表示不大可能实现的假设,而是表示一种希望或不希望发生的动作。如:
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