they _saw_(saw) a boy_fall_(fall) into the river while they_
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they _saw_(saw) a boy_fall_(fall) into the river while they_were passing_(pass)it yet.讲详细为什么
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
再问: see sb do和see sb doing 有两种形式,这里为什么是原形?
再答: fall 是短暂性动词,掉下去的一瞬间动作就完成了 如果用falling 进行时,说明动作一直在延续,一直掉下去?不合实际。。 所以用原形比较好
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
再问: see sb do和see sb doing 有两种形式,这里为什么是原形?
再答: fall 是短暂性动词,掉下去的一瞬间动作就完成了 如果用falling 进行时,说明动作一直在延续,一直掉下去?不合实际。。 所以用原形比较好
they _saw_(saw) a boy_fall_(fall) into the river while they_
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