Question

If only 后面要接虚拟语气吗

课文中有这样一句 if only i knew then what i know now
但是老师说要接虚拟语气 可不可以解释一下这为什么没用

Answer 1

If only I knew then what I know now !
要是当初我就懂得了我到现在才领悟的东西，该多好啊!!

从属连词If only表示不能实现或难以实现的意愿或愿望，
意思为：要是……该有多好啊;但愿...,常引导虚拟语气的条件句或感叹句
(1)表示与现在事实相反的假设，用一般过去时
If only I were as clever as you！
要是我像你一样聪明该多好啊！
(2)表示与过去事实相反的假设，用过去完成时
If only we had arrived in time, we would not have missed the train.
要是我们按时到，就不会误车了
If only he had been here.
要是他当时在这儿就好了
If only I had another chance.
要是我再有一次机会就好了
Look at the trouble I am in! If only I had followed your advice
(3)表示与将来事实相反的假设，用would +动词原型
If only it would stop raining!
但愿雨停下来。

注意区别:
Only if是由充当前置修饰语的副词only和从属连词if组合而成的，副词only是中心词,而从属连接词if则只是用来连接从句的，因此，它表示“只有……(才)；只有在……的时候，唯一的条件是……”的意思,引导陈述语气的真实条件句.用法：置于句首时，主句要倒装。

Only if you study hard, you will pass the exam.
只要你努力学习，就会通过考试
Only if I get a job will I have enough money to go to school.
我只有找到了工作才有足够的钱上学。
The company will succeed only if it have sufficient backing.
只有当该公司获得足够的资助，它才会成功
I can buy the house only if a mortgage for 2000 dollars is available.
只有拿到两千美元的抵押贷款，我才买得起那栋房子

祝学习进步!!!

Answer 2

if only引导的条件句，通常用来表示说话人对某事所寄予的某种强烈愿望，相当于as long as。它可以独立使用，用来表示由于客观条件限制，为某事不大可能或完全不可能实现而感到惋惜或遗憾的复杂心情，常用虚拟语气。
例如：
If only I were as clever as you！
要是我像你一样聪明该多好啊！
If only you had not told Tom what I said, everything would have been all right.
要是你没有把我 的话告诉汤姆就好了，那样就不会出什么问题了。It is hard to avoid mistakes; if only they are conscientiously corrected, it will be all right.
错误总是难免的，只要认真地改正，也就好了。

Answer 3

这里用了虚拟语气。if only＋从句（与过去事实相反用 had done，现在事实相反用 did ，将来事实相反用would／should／could ＋do。要是什么就好了。你这个句子与现在事实相反，从句谓语用了过去时。反正给了你这个句型，以后凡是考if only只管用句型模仿，高考超不出这个知识点。再遇到这类题你一辈子也不会错了

Answer 4

if only 后面就是要跟虚拟语气的
译为假如....就好了！
除非是if 和only 是分开两次，不是一个结构
比如说，if only two people want to have a picnic,then we will cancel it.

Answer 5

与现在事实相反的用一般过去式.例如：If only he could come here now!
与过去事实相反的用过去完成时.例如：If only I had finished my homework yesterday!