do you often see william _____(run)on the playground?no but .答案给的是running为为什么不用run

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doyouoftenseewilliam_____(run)ontheplayground?nobut.答案给的是running为为什么不用rundoyouoftenseewilliam_____(r

do you often see william _____(run)on the playground?no but .答案给的是running为为什么不用run
do you often see william _____(run)on the playground?no but .答案给的是running为
为什么不用run

do you often see william _____(run)on the playground?no but .答案给的是running为为什么不用run
running
see sb doing 看见某人在做某事,强调正在做,进行中的意思
see sb do 看见某人做了某事,强调有这件事发生
句子中有个副词often ,因此强调的是看见某人在跑步的情景,因此用这个

因为所看到的不是全过程,而是部分过程

see是谓语动词,后面在加动词run,就两个动词了.
running 动名词,也有动词的意思.担不是动词