翻译：如果他是我会怎么做。

If he were me ,what would he do?
是用虚拟语气的表达。

What would he do if he were me?

If he were me, what could he do?

最地道的说法应该是:what will he do if he was in my shoes?

if he were me ,what would he do?
虚拟语气里，谓语一定要用过去时，希望能帮到你

What would him do, if he were me.