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 si 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