【Exposedinthesunforalongtime,thedoorofthoseposterhasgone.Beingexposedinthesunforalongtimewillhavebadeffectsonus.这类句子英语老师说句子中间有逗号开头用ed,无逗号用ing是怎么回事?为什么有的句子】
Exposedinthesunforalongtime,thedoorofthoseposterhasgone.
Beingexposedinthesunforalongtimewillhavebadeffectsonus.
这类句子英语老师说句子中间有逗号开头用ed,无逗号用ing是怎么回事?为什么有的句子又不是这样的,很疑惑啊