Keep up with 和 Catch up with 有什么不同?记得其中有一个是“想到”的意思

keep有保持的意思而catch有抓住的意思，Keep up with就是 跟上、紧跟的意思， Catch up with有抓住什么、赶上什么的意思，想到常用come up with

keep up with和catch up with 都有赶上某人,使自己不落后 的意思,但前者注重保持此时状态,而后者注重超越此时状态而赶上别人.eg.Your English is terrible ,if you do not work hard,you will not catch up with others.eg.I must work hard ,or I will not keep up with my classmates.