Hi esra'a .. Hope you're fine ♥
1- the error is in the word "an", we should put "a" instead of "an
The second error that there isn't "the" before "hospital
So the sentence will be :
there is a university behind the hospital
2- the error is the word "are", we should put "is" instead of "are" because the phone is single
So the question will be :
is this her phone ?
The first error in the answer is in "is this" .. We would put "this is" instead of "is this" because it's an answer and not a question
The second error is in the word "you" , we should put "your" instead of "you" because the phone belongs to this person
So the answer will be :
No, this is not her phone , it is your phone
3- the first error here is in the word "these", we should put "this" and not "these" because the book is single
So the question will be :
is this your book ?
The first error in answer is in the the word "you" , we should put "your" and not "you" because the book belongs to this person , and denotes ownership
So the answer will be :
Yes , this is my book
✨Have a nice day, güzel