if only

a) used to express a strong wish, especially when you know that what you want cannot happen
If only he had talked to her sooner! If only I weren't so tired！强调语气，虚拟，知道是不可能发生的

b) used to give a reason for something, although you think it is not a good one
Media studies is regarded as a more exciting subject, if only because it's new.

虽然你知道这似乎看起来不能算个好理由，但怎么着也算个理由把

只能把if only当做某种修饰成分修饰着because

还是想问下

有人说IF 是修饰ONLY BECAUSE 的

到底哪个对呢

if only beacuse

有4种观点

1.if only强调语气（要是。。。。。。虚拟）

2.if only，【used to give a reason for something, although you think it is not a good one】

3.if 引导条件状语从句，only修饰beceuse

4.if only because是一体的

我倾向于1和2

longman的解释中1和2都有，我觉的也都说的通，

1.要是复制应该避免，则建造。。。将是浪费资源

2.仅仅因为（语气上就是说就算是条理由吧），建造。。。将是浪费资源，因为是复制应该避免（这是个什么破理由？！现在暂且凑合算个理由吧）

2更好一点

我觉的以后看到if only because就背下来，现在大家的意见和以前的帖子的建议就是这样4分5裂的