Question

1. He is taking a walk at the park.
2. He is taking a walk in the park.
3. He is taking a walk on the park.
4. he is taking a walk near/ in front of the park.
[Does #1 mean #4? Or does #1 mean #2 or #3?]

5. He is reading a book at the library.
6. He is reading a book in the library.
7. He is reading a book near the library.
[Does #5 mean #7? Or does #5 mean #6?

Answer 1

#1 means the same as #2. #3 is not used!!
#4 is OK with either variation, but does not mean the same as #1.

#5 means the same as #6, not #7.