他正在等待用英文怎么说

"He is waiting" 是表示“他正在等待”的英语表达方式。

来源：该表达是通过动词"to wait"和第三人称单数现在时的形式"is" 来构成的。

例句1: He is waiting for the bus. (他正在等公交车)
例句2: He is waiting for his friend to arrive. (他正在等他的朋友来)
例句3: He is waiting for the results of his exam. (他正在等考试结果)