If anything dangerous _______ (happen), you can find them easily.答案是happens,那这和 What's happened 有什么区别呢?

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Ifanythingdangerous_______(happen),youcanfindthemeasily.答案是happens,那这和What''shappened有什么区别呢?Ifanythin

If anything dangerous _______ (happen), you can find them easily.答案是happens,那这和 What's happened 有什么区别呢?
If anything dangerous _______ (happen), you can find them easily.
答案是happens,那这和 What's happened 有什么区别呢?

If anything dangerous _______ (happen), you can find them easily.答案是happens,那这和 What's happened 有什么区别呢?
条件状语从句,用一般现在时表示
What has happened代表名词,可以作主语或宾语成分.

对于定理,经常发生的事情用一般现在时,也就是happens,对于过去发生的事情,提问时用happend表示已经过去的事情。