if only的用法 “if only” 和“only if"的用法和区别是什么？
if only\u5728\u865a\u62df\u8bed\u6c14\u4e2d\u7684\u5177\u4f53\u7528\u6cd5\u5f20\u8001\u5e08\u5e26\u4f60\u5b66\u865a\u62df\u8bed\u6c14\uff01
if only\uff0c\u54b1\u4eec\u5728\u5b66\u6821\u4e00\u822c\u53ea\u5b66\u5230\u5b83\u7684\u4e00\u4e2a\u542b\u4e49\u3002
If only I were you!如果我是你.
If only (expressing a strong wish表示强烈的愿望)但愿，真希望，只要...就好了：
If only he wouldn't eat so noisily.但愿他吃东西不这样大声就好了。/If he would only learn to eat quietly!但愿他学会吃东西时小声点就好了！
If only+称述句 "要是...就好了/该有多好啊!"
该句用虚拟语气,其构成如下:
1. 对已发生的动作的感叹,从句谓语用过去完成时
If only I hadn't lied to her yesterday!
2. 对现在的动作的感叹,从句谓语用一般过去时(be动词用were)
If only I were a millionaire!
3. 对将来的动作的感叹,从句谓语用过去将来时
If only he would come here tomorrow!
if only
adv.
1. 要是 (表示虚拟语气,动词的时态要用过去时,be动词一律用were. 如果动作本身就发生在过去,那就要用过去完成时.)
If only it hadn't!
要是没有登就好了!
If only I could swim.
要是我会游泳该多好.
If only I were rich.
但愿我很富.
If only she would come!
如果她能来就好了！
If only I had seen it.
要是我看见就好了。
If only someone could help me!
有谁能帮助我就好了！
2. (表示强烈的愿望) 但愿，真希望，只要...就好了：
If I only knew!
要是我知道该多好。
If only he will!
他愿意就好了！
Oh, if only he will!
要是他愿意就好了！
扩展阅读：if only引导虚拟语气 ... ifonly三种虚拟语气 ... if only后面加什么时态 ... ifonly和onlyif的区别 ... if only 虚拟语气总结 ... it is high time that ... only if用法归纳总结 ... if only与过去事实相反 ... even though和even if ...
