表示对将来事实的假设
条件状语从句谓语用过去时,主句谓语用should/would/could/might 动词原形的形式。
例:If I should win the lottery,I would buy a car. 如果我中彩票了,会买一辆车。
(4)省略if的倒装句
虚拟条件句的从句部分如果含were,should或had,可将if省略,再把were,should或had移到从句句首,构成倒装。
例:Had I enough money,I would run a company. (= If I had enough money,I would…)
如果我有足够的钱,就会自己开办公司。
2.表示愿望的虚拟语气
表示主观愿望时可以用wish,if only,would rather/would sooner/would just as soon,would prefer,might as well 等。
(1)wish后的宾语从句的用法
① 表示对现在情况的虚拟:从句动词用过去式或过去进行式表示,be的过去式用were。
② 表示对过去情况的虚拟:从句动词用had 过去分词。
③ 表示对将来的主观愿望:谓语动词形式为would/could/should/might 动词原形。