如果我...该多好 怎么表达？

If I were 。。。。, everything would be all right.

It will be wonderful if I ……

What if I （后接虚拟语态）

If only I could...

I'm sure.

if only.........
what if............
后面都要用虚拟语气，比且“该有多好”不用翻译了