“catch up”和“catch up with”有什么区别？

“catch up”和“catch up with”有什么区别？

用法与catch up with相近. 
catch和catch up和catch up with后均跟人或物
eg：You must run if you want to catch the bus? catch作“赶上”.
catch和catch up with都有“赶上”的意思.
那么catch up和catch up with有什么区别呢.的水平”。 
例如：You walk on ahead,I shall soon catch up with you . After being out school so long,she had to work hard in order to catch up with the others.catch up
赶上（工作进度）....，也可以用于抽象意义上的“赶上；赶上. 
If we go home now,we might catch the 10:00 news.catch up with
除了“追赶上同一方向行进的人之外；叙旧（即互相补上个人情况），主要是指“赶上汽车、火车等交通工具”