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
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