You know watching TV too much is bad for your eyes.此句中为什么用watching而不用watch?
问题描述：
You know watching TV too much is bad for your eyes.此句中为什么用watching而不用watch?
答
watch 是动词
know后接宾语.即watching TV too much is bad for your eyes作know的宾语从句.而watching TV too much 又做宾语从句中的主语.watching是watch的动名词形式.用动名词形式做主语.一个句子中不能出现两个动词.