Lemme fill you in. 我跟你说吧

Can you fill me in on why Nick broke up with me?

你能告诉我为什么尼克要跟我分手吗？

Alright， I'll fill you in since you are so eager to know.

好吧， 既然你这么想知道我就告诉你吧。

Tina got sick these days. I need you to fill in for her.

蒂娜这几天生病了， 我需要你来顶替她。