关于虚拟语气的倒退时态Youyesterday,ifyouwerereallyseriousaboutthejob.A)oughttocomeC)oughttobecomingB)oughttohavecomeD)oughthavecome这题很明显与过去事实相反,所以主句用oughttohavedone,过

Question

关于虚拟语气的倒退时态
You _________ yesterday,if you were really serious about the job.
A) ought to come C) ought to be coming
B) ought to have come D) ought have come
这题很明显与过去事实相反,所以主句用ought to have done,过去完成时.
与现在事实相反和与将来事实相反还按正常的倒退么?与现在事实相反,从句用过去时没错吧,主句不是用一般时的么?
那么下面这道题就没法解释了：
But for friction,people _________ neither walk,nor even stand up.
A) can B) were able to C) will be able D) could
从句是一般时,由but for引导,正确答案选D,怎么回事?
意思是一直退是吧?
而不是像百科里写的那样：
① 表示与现在事实相反的情况
（条件）从句谓语动词形式 主句谓语动词形式
谓语动词用一般过去式
（be用were） should/would/could/might+动词原形（过去将来时）
③表示对将来情况的主观推测（可能相反或可能性很小）
从句谓语动词形式 主句谓语动词形式
If+主语+ ① should+动词
② did
③were to do
(①通常与一个表示时间状语连用)其 中were to do可能性最小,
should/would/
could/might+动词原形
与现在或将来事实相反 假设的条件状语从句用过去 主句中的情态动词用过去时 如would should could等
回答者：snakeslave - 四级 2009-12-11 21:13
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都是过去时，那不是没倒退么？

Answer 1

与现在或将来事实相反 假设的条件状语从句用过去 主句中的情态动词用过去时 如would should could等
But for friction, people _________ neither walk, nor even stand up.
A) can B) were able to C) will be able D) could
从句是一般时,由but for引导,正确答案选D,怎么回事?
这里没有从句,只是一个条件状语 但不是从句 也就无所谓时态了 如果改成从句的话就是
if there were not friction