elate 做不及物动词时,后跟to
存在结构就是sth.relate to sth./sb.
relating是分词形式,可以作后置定语.说明sth和主语主动关系
the question relating to our affairs is under discussion.
=the question which is relating to.
related是形容词 主要结构就是sth.be related to
the questions are related to our affairs.
the question related to our affairs is under discussion（可作后置定语)=the question which is related to ...(从句)