Catch up
赶上；与别人看齐
I'd love to go with you but I've got some catching up to do.
我也想跟你一起去，但我还得先赶进度。

Behind
在后面；落后；忘掉过去。
Look behind you! Something is coming!
看你身后！有东西过来了！
I'm behind in my work.
我积压了很多工作。
The accident is behind you now, so try to forget it.
那场事故已经过去了，忘了它吧