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问题: 帮我分析一下这两个句子成分

Whether he can climb up to the top of the mountain is still a mystery to us.
It is still a mystery that whether he can climb up to the top of the mountain.
都是什么从句?

解答:

Whether he can climb up to the top of the mountain 是主语,is 是谓语,mystery宾语.句子的意思是:他能否爬到山的顶峰对我们来说仍旧是个迷.
It 是形式主语,Whether he can climb up to the top of the mountain 是真正的主语,因为主语太长了,如果把它放在前面就给人一种头重脚轻的感觉,所以就用一个形式主语来代替.