going to concerts 在这里作主语,是going to concerts has become a part of their lives这句话的主语,前面没有省略任何东西,这个动名词和不定式一样,都可以作主语
动词的-ing形式在起名词作用时,称为动名词,动名词在句中可以：
1）用作主语：
Dancing bored him.跳舞使他厌烦.
2）用作表语：
Her hobby is collecting stamps.她的爱好是集邮.
3）用作宾语：
Please stop talking.请不要说话了.
4）用作介词宾语：
He was arrested for smuggling.他因走私而被捕.
5）构成合成词：
Who won the singing contest?歌咏比赛谁赢了?
还可用于下面这类句子中：
No smoking.禁止吸烟.No loitering.不许在此逗留.
No spitting.禁止吐痰.No parking.禁止泊车.
作为动词,它也有几种形式：
主动形式 被动形式
一般式 doing being done
完成式 having done having been done
它也可以有它的宾语（a）或状语（b）：
a.He was fond of playing tennis .他喜欢打网球.
b.She is thinking of going home this summer.她想今年夏天回家.
它还可以用一个代词或名词所有格表示其逻辑上的主语：
He disliked her working late.他不喜欢她工作到很晚.
用名词所有格显得比较文气,在口语中常把’s省略掉：
I don’t remember my mother’s talking about it.(较文气的说法)
I don’t remember my mother talking about it.(较口语化的说法)
有些动名词已变得接近名词或变成名词,它们可有复数形式（a）,前面
可加冠词（b）,甚至有定语修饰(c)：
a.Dickens often gave rendings of his works.狄更斯常常朗读自己的作品.
b.Who did the cooking?谁做的饭?
c.I always enjoy a little light reading.我一向喜欢读点轻松的东西.
这些可称为名词化动名词（Verbal Nouns）.有些以-ing结尾的词已完全
变成名词：
He could not analyze his feeling.他没法分析自己的感情.
Take good care of your belongs.注意保管好你的东西.
