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含义不同。only if意为只有……才、唯一的条件是……，副词only是中心词，而从属连接词if只是用来连接从句的。而if only是if的一种强化形式，不仅能表达说话人的愿望，还能表达条件，意为要是...多好。
if only和only if的用法
一、用法不同
1、if only
用法：if only 用于虚拟语气，它用来表达一个不可能实现的愿望或假设。
2、only if
用法：用于引导条件状语从句，比if所表达的语气更强烈。置句首可引起倒装。
二、含义不同
1、if only
释义：要是...就好了。
2、only if
释义：仅仅如果。
三、侧重点不同
1、if only
解析：if作为从属连词,可引导条件状语从句、让步状语从句和名词从句。
2、only if
解析：if可引导名词性从句,作“是否”解,常放在ask, doubt, know, learn, see, wonder等动词后。一般用在口语中，而且不能用于句首。
only if的造句
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。
Only if a teacher has given permission is a student allowed to enter this room.
只有得到教师的允许，学生才可以进这间屋。
Our prices are in force only if you order by return mail.
我方价格仅以你方速复我订货，才有效。
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。
if only造句
if only the sun would come out, we could have a wonderful day.
如果太阳出来了，我们就可以有一个美好的一天。
A contract is invalidated if only one party signs it.
Now if only the robot could pay college tuition.
If only I hadn't been so smug, if only I'd gone to the window, perhaps I could have done something.
But I was only relieved to have my burden removed, if only temporarily.