有关非谓语的几个问题,
beingexposedtotheair,willmakewoundshealmorequickly.
和exposedtotheair,willmakewoundshealmorequickly.
havingbrokenawayfromherbadhabits,shehasbecomeanexcellentteachers
和brokenawatformherbadhabits,shehasbecomeanexcellentteachers,
上面的句子有什么区别,什么时候要用being,什么时候不用,什么时候要用having,什么时候不用要详细一点.