if only 和only if的区别和用法

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 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.

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。