同学你好，该知识点来自沪江网校《英语零基础直达大学六级【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
manage to do 完成（困难的事）；勉力完成
We managed to get to the airport in time.
我们设法及时赶到了机场。

be able to do 强调有能力做某事
I'll be able to speak German in another few months.
再过几个月我就能说德语了。

succeed 强调“成功”的感觉
We have already succeeded in working out ground rules with the Department of Defense.
我们已经成功地与国防部敲定了基本原则。

其中manage to do和succeed in doing sth有时候可以互换。

期待助助的回答能帮到同学~祝同学学习进步~