if条件句的虚拟语气
if条件句的虚拟语气如下：
if句又叫条件句，表示“假如”，是状语从句的一种，是一种非常常见的从句形式，用来提出一种与客观现实不相符或根本不可能存在的条件，拥有引导的三种虚拟语气形式：
1、表示与现在事实相反。
If I were you, I would try it。
如果我是你，我会试试的。
2、与过去事实相反。
If he had realized that, he would have run away while there was still time。
如果他意识到这一点，他就会趁着还有时间的时候逃跑。
3、与将来事实相反。
If it were should rain tomorrow, the meeting would be put off。
如果明天下雨，会议就会推迟。
词义辨析：
一、if，in case这两个词(组)的共同意思是“以防万一”。二者均可引导条件从句,其区别是：
if可用于任何时间，而in case只指将来时间。例如:
1、I am taking an umbrella in case it rains later on。
我带着一把伞,以防一会儿下雨。
2、I'll take an umbrella if it rains later on。
要是一会儿下雨,我就拿把伞。
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