what if: 如果...将会怎么样

例如:
1. What if it is true?
如果这是真的又该如何呢？

2. What if he doesn't agree?
如果他不同意该怎么办呢？

3. What if he comes back now?
如果他现在回来怎么办？

4. What if I fail!
即使我失败了又怎样！

5. What if the boy's parents should die?
如果那男孩的父母死了该怎么办呢？


only if: conj. 只有当(只是在...的时候)
例如:
1. 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。

2. A compound proposition that has components joined by the word and or its symbol and is true only if both or all the components are true.
综合命题由和或其符号所连接的子句组成的复合命题，只有当所有子句为真时，该句才为真

3. 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。

4. 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。
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