对将来进行假设主要有三种情况:
1,if条件从句是谓语用动词过去式,则后面的主句是情态动词加动词原形
例:If I came tomorrow ,we would have the meeting.
2,if条件从句是were to形式,则后面的主句也是情态动词加动词原形
例:If it were to rain tomorrow ,the meting would be put off.
3,if条件从句是should do形式,则后面的主句可以用情态动词加动词原形,也可以用祈使句(但注意,祈使句仅适用于前面从句是should do形式的)
例:If it should rain tomorrow,don't expect me./I would not go there.
扩展资料
对现在事实相反的虚拟语气
1、表示与现在事实相反的情况
从句:If+主语+动词一般过去时(Be动词用were)
主句:主语+ should/would/might/could+do:
If I were you,I would take an umbrella.
如果我是你,我会带把伞。(事实:我不可能是你)
If I knew his telephone number,I would tell you.
如果我知道他的电话号码,我就会告诉你。(事实:不知道)
If there were no air or water,there would be no living things on the earth.
如果没有水和空气,地球上就不会有生物。(事实:地球上既有空气也有水)
If I had any money with me,I could lend you some.
如果我带钱了,我就会借给你些。(事实:没有带钱)
If he studied harder,he might pass the exam.
如果他再努力些,就能通过考试了。(事实:没有努力)
If I were you, I'd wear a shirt and tie.
如果我是你,我就会穿衬衫和领带。(事实:我并不是你)
2、表示与过去事实相反的情况
从句:If+主语+had+done
主句:主语+should/would/might/could+have done
eg:If I had got there earlier,I should/would have met her.
如果我早到那儿,我就会见到她。(事实:去晚了)
If he had taken my advice,he would not have made such a mistake.
如果他听我的劝告的话,就不会犯这样的错误了。(事实:没有听我的话)
参考资料:百度百科-虚拟语气
一般过去时和虚拟语气是两种不同的语法结构,它们在用法和含义上有所不同。
一般过去时: 一般过去时用于描述已经发生或已经完成的动作、事件或状态。它表示在过去某个特定的时间点或时间段内发生的事情。比如:
"He studied hard for the exam last night."(他昨晚为了考试努力学习。)
"They visited Paris two years ago."(他们两年前去过巴黎。)
虚拟语气: 虚拟语气用于表示假设、愿望、建议、可能性等非现实的情况。它通常使用"would", "could", "should", "might"等词来表达。虚拟语气包括以下几种形式:
虚拟条件句: 用于表达假设或假设条件。比如:"If I were rich, I would travel around the world."(如果我富有,我就会环游世界。)
虚拟愿望句: 用于表达愿望、期望或希望。比如:"I wish I could speak fluent Spanish."(我希望我能说一口流利的西班牙语。)
虚拟推测句: 用于表达推测、猜测或假设的情况。比如:"She might have passed the exam if she had studied harder."(如果她学习更努力一些,她可能会通过考试。)