！manage后面接动词不定式to do 形式，manage to do中文意思是挣扎做某事设法完成某事
One can always manage to do more things， no matter how full sb.'s schedule is in life.一个人总是可以做更多的事，不管他生活中的日程安排有多满。
How did you manage to do that?
manage动词，勉力完成，应付，设法完成的意思。跟动词不定式，即manage to do设法完成的意思，He managed to finish the work.t设法完成了工作。