Catch up
趕上;與別人看齊
I'd love to go with you but I've got some catching up to do.
我也想跟你一起去,但我還得先趕進度。
Behind
在后面;落后;忘掉過去。
Look behind you! Something is coming!
看你身后!有東西過來了!
I'm behind in my work.
我積壓了很多工作。
The accident is behind you now, so try to forget it.
那場事故已經過去了,忘了它吧