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come up clear up

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come up clear up
The question has not come up yet .The problem has not been cleared up yet .为什么一个被动一个不被动?
come up clear up
The question has not come up yet
译：此问题还未发生.（主语就是the question,不需要用被动语态）
The problem has not been cleared up yet
译：此问题还未解决（查清）.（一个问题需要解决或查清,肯定不是这个问题自己查清或解决.它需要“某个人"或其它来解决查清此事.这就是被动语态,此句强调这个问题还没有被解决,至于谁没有解决查清此事,都不重要.
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