i was often a little tired after a day's work and watch TVdemands vevy little effort.为何WATCH加ING

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i was often a little tired after a day's work and watch TVdemands vevy little effort.为何WATCH加ING

and后面是另外一个句子,watching TV在这个句子里作主语.watch只有用ing形式才能在句子里做主语.

watch 是动词 在这里就要加ing 表状态