标题: og15 sc69 关于虚拟语态／条件从句求解释啊！！嘤嘤嘤 [打印本页] 作者: Liangll 时间: 2017-7-22 16:44 标题: og15 sc69 关于虚拟语态／条件从句求解释啊！！嘤嘤嘤 Affording strategic proximity to the Strait of Gibraltar, Morocco was also of interest to the French throughout the first half of the twentieth century because they assumed that if they did not hold it, their grip on Algeria was always insecure.
a. if they did not hold it, their grip on Algeria was always insecure
b. without it their grip on Algeria would never be secure
c. their grip on Algeria was not ever secure if they did not hold it
d. without that, they could never be secure about their grip on Algeria
e. never would their grip on Algeria be secure if they did not hold it
正确答案是b
我自己的理解是这样的：
关于条件状语从句有两类：一种是真是条件句，另一种是非真实条件句
（1）真实的
if he does not hurry up, he will miss the bus.
if he is free, he will ask me to tell stories.
（2）非真实的
If I were you, I would go at once
If there were no air, people would die
1)和现在事实相反的：if +过去式＋主语＋would/should/might/could
if I were you, I would take an umbrella
if I knew his telephone number, I would tell you（事实是我不知道他的电话号码）
2) 和过去事实相反的：
if +had done＋主语＋would/should/might/could + have done
if I had got there earlier, I should have met her.
3) 和未来事实相反的
