“如果明天开始爆发世界大战” 英语怎么说？

What if World War III happened tomorrow?
(你是假设，假设状态不能用现在时。要用过去时。
如果是对过去的假设，比如过如果“XX还在的话”，那就要用完成时了）

Hope This helps!

Good Luck!

If new world war will break out tomorrow

If new world war breaks out tomorrow

provide that tomorrow the world war breaks out.

If the World War were to break out tomorrow该用虚拟语气