句子意思是 当他们经过的时候看见一个男孩掉河里了
根据句意,本句用过去式较合适
所以是they saw (saw 是 see的一般过去式)
看见某人做某事 see sb do sth 所以fall 应用原形fall
while 后面的从句通常用进行时态,所以是 过去进行时 were passing
they _saw_(saw) a boy_fall_(fall) into the river while they_
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