adjectives - To explain or to be explained


I have searched lots of websites to understand which one is correct in this sentence:


It is too hard to (be) explain(ed).

Some people say that after some adjectives called tough adjectives you can't use the passive form of verbs. I have heard from some native speakers that It is too hard to be explained is very strange to their ears. So I search on the Internet and I found that at least 14 million people think that to be explained is correct and they actually have used it. I am sure that I am missing something here. Maybe they are used in different situations. But I couldn't find any real difference between them.


Any help is more than welcomed.


P.S: To further complicate the situation for a word like pass, when I searched it on the Internet, you can't really say "Exam was too difficult to be passed".




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