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I was taught that even though the following two senteces have the same meaning,the sentence 2 sounds more natual.But I can not comprepend the sentence 2 grammatically, which word is the subject? Its grammatical structure is hard to understand. 1) Every school has always someone everyone has a crush on.2) In every school is someone everyone has a crush on.
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moguwai0071) Every school has always someone everyone has a crush on

This is unnatural gibberish. "Have a crush on" is infatuation or puppy love.

Girls can have a crush on boys, and vice versa. But there cannot be one person that everyone has a crush on.

I have the same complaint for the second sentence.

The natural expression is:

In every school there is always one girl that all the boys have a crush on.

Comments  
moguwai007In every school is someone everyone has a crush on.

I can't comprehend it either. I need a subject and, in my opinion, the existential "there" would do the syntax job here:

In every school, there is someone everyone has a crush on.