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