1.he's not calling the shots. "call the shots"＂负责或管谋事的＂
eg: You must do what I tell you because I'm calling the shots around here.我让你干啥就干啥因为这儿我说了算．
Who is calling the shots for your team?你们队谁是头．
2.What's your beef with him. "beef"＂有过结＂
eg: Luke will not go to the party with us because he has some kind of a beef with the host. Luke 不会和我们去参加聚会了，因为他和party主人有点过结．
I have a big beef with people who say one thing and do something different.我很看不上那种心口不一的人．
3.It fell into my lap. "sth falls into one's lap" ＂天上掉馅饼或意外得到的＂
eg: My first chance to visit China fell into my lap.我第一次到中国是个天上掉馅饼的好事．
Fred's new job practically fell into his lap.Fred的新工作几乎是天上掉馅饼的大好事．