many students have the habbit of watching too much TV这里为什么用watching

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manystudentshavethehabbitofwatchingtoomuchTV这里为什么用watchingmanystudentshavethehabbitofwatchingtoomuch

many students have the habbit of watching too much TV这里为什么用watching
many students have the habbit of watching too much TV这里为什么用watching

many students have the habbit of watching too much TV这里为什么用watching
of 是介词,后面要跟名词或者动名词,所以用动名词watching

介宾结构。。
the habbit of sth /doing sth
有做某事的习惯 。。

of 介词后跟名词watching too much TV是名词短语

因为watch 是动词 ,of是介词 介词后的动词用-ing形式