He's impatient to know what happened.
他急于想知道发生了什么事。
He's so impatient that waiting in queues is sheer purgatory for him.
他毫无耐性,对他来说排队等候完全是活受罪。
He was such an impatient driver (=He was so impatient a driver) that he went through the red light.
他是这样没有耐心的司机,所以他闯红灯了。