Don't swallow everything he says. 不要对他的话毫无保留地相信. Every rumor has a grain of truth. 每一个谣言多少都有点儿真实性. He's lying his ass off. 他的谎大得屁股掉下来.
He's a filthy liar. 他是龌龊的撒谎家. Believe half of what you see and none of what you hear. 目睹者仅可信其半,耳闻者则全不可信. Wise is the man who stops a rumor. 谣言止于智者.
Don't you listen to anything she says. 她说什么你都不要听. Unless you cross your heart, I won't believe you. 除非你发誓, 否则我不信.
