已经熟悉到可以和他开玩笑的程度的英文

became familiar enough to play tricks with

• 已经:    already
• 熟悉:    know very well
• 到:    39
• 可以:    can; may
• 和:    mix; blend
• 他:    he
• 开玩笑:    play a joke on; ma ...
• 的:    4次方是 The fourth po ...
• 程度:    level; degree