might be able to和might have to 区别在哪里?

问题描述:

might be able to和might have to 区别在哪里?
最好能有例句哦.

Many years later,man might be able to(或许能够)find ways to get his air,food and water from the moon itself.I might have to turn to leave -- and I discovered the story of Merrill Lynch.我可能不得不悲...