if only 和only if的区别和用法

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if only 和only if的区别和用法

if only 用于虚拟语气,表示“要是...就好了”
If only one had an unlimited supply of money!
要是财源不断就好了!(与现在事实相反)
only if 意思“仅仅如果”,用于引导条件状语从句.

if only: 要是...多好
eg: If only he had been here.
要是他当时在这儿就好了。
only if: 只有当
eg: 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。

if only 表虚拟,相当于how good it will be if ……,
if only i had 10,000 yuan.要是我有一万元就好了。
only if 后面是条件,想要……,只有……
you will not be late only if you get up on time.