drop在这里为什么要用过去分词?Happiness is like a pebble dropped into a pool to set in motion an ever-widening circle of ripples.As Stevenson has said,being happy is a duty这里的drop是因为是被动的掉下去才用dropped的吗?还

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drop在这里为什么要用过去分词?Happiness is like a pebble dropped into a pool to set in motion an ever-widening circle of ripples.As Stevenson has said,being happy is a duty这里的drop是因为是被动的掉下去才用dropped的吗?还
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drop在这里为什么要用过去分词?Happiness is like a pebble dropped into a pool to set in motion an ever-widening circle of ripples.As Stevenson has said,being happy is a duty这里的drop是因为是被动的掉下去才用dropped的吗?还
drop在这里为什么要用过去分词?
Happiness is like a pebble dropped into a pool to set in motion an ever-widening circle of ripples.As Stevenson has said,being happy is a duty
这里的drop是因为是被动的掉下去才用dropped的吗?
还有第2句的Stevenson has said为什么要用现在完成时,而不是用过去完成时?

drop在这里为什么要用过去分词?Happiness is like a pebble dropped into a pool to set in motion an ever-widening circle of ripples.As Stevenson has said,being happy is a duty这里的drop是因为是被动的掉下去才用dropped的吗?还
pebble是石子的意思 这个石子肯定是被人扔井水池里的 不会自已就掉进去了 ,所以用的过去分词(被动)而不是用的现在分词(主动)
第二句用 has said 而没有用 had said 是因为这句话 名人名言 就相当于一个真理一样(当时这个不是真理,只是可以这样理解)

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过去分词就是slept,所以像slip, drop,这些都是特例。没有什么公式来决定是 为什么双写,答案就是这样,为什么我们叫人而不叫鬼?