How to use "What if"? I am going to know in what situation I can use this conditional question!?
You use 'what if' to suggest an action in the future. It is usually used with the present tense of the verb. For example,
A: What do you want for Jenny's birthday party?
B: What if we have a surprise party!
A: Great idea!
Also, I just wrote a more complete article about the use of what if, suppose and supposing. Hope it helps!