is it "he must have fallen" or "he must have fell"?why

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is it "he must have fallen" or "he must have fell"?why
thank you

he must have fallen因为在have后用的是过去分词.不是过去式.这种结构表示推测.意思是：他一定是跌过跤.
再问：但是如果你说have后用的是过去分词，那么“must“是可以去掉的，就变成了"he have fallen“……这似乎不对吧如果把”must have“当作一个的话去掉就是”he fell“ 这是对的吗？如果这样的话应该是什么呢？
再答： he must have fallen 他一定跌过跤。这句中因为有情态动词 must所以表示推测。又因为must后有have所以后一定用过去分词。 he has fallen是你要问的问题。这句是他跌过跤。这句不是推测。

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