haveto和should的用法区别

have to可以代替must,表示“必须”、“不得不”,并可以补充must所缺的时态.should表示“宜于”,should一般表示“在我看来这是可取的”或“这是（你）应该做的事”。

Some college students will have to live out.

有些大学生将不得不住在校外。

We may have to take military action.

我们可能不得不采取军事行动。

It\'s very important to me that you should be there.

你应该到场，这对我很重要。

By that time the new system should be up and running.

到那时这个新系统应该会运转起来了。