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".