改错on seeing the boy fell into ther river,she sprang to her f

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改错on seeing the boy fell into ther river,she sprang to her feet and went to the rescue.
这道题是fell错了吧,是不是应该把fell改成falling,但是我有点弄不明白非谓语动词为什么要用falling,而不用省to的不定式,

首先要知道非谓语动词有三种形式
1 (to) do 有将来意味
2 doing 表主动
3 done 表被动
此句话中“fell into the river”掉进河里,暗含主动并非将来或被动而且别掉进河里也讲不同,看到的应该是正在发生的事也不能不过用将来时.

改错on seeing the boy fell into ther river,she sprang to her f 请问,这道改错题on seeing the boy fell into the river,she sprang to On seeing the young child （）into the river, the man sprang t On seeing the young child fall into the lake,Joan sprang to when the boy playing by the river fell into the river ,I was he saved a boy.the boy fell into the river yeste 21.Yesterday ____ 8-year-old boy fell into the river.The boy The boy fell into the river and called a___ for help 三道英语题When the boy fell into the cold river,his friend s_____ 单项填空. Yesterday _ 8-year-old fell into the river. _ boy was A little boy fell into the river and r___there for two minut all passengers aboard fell into the river