The students slowly walk to return in theto school after the break.

Mary's dog's runs after her ball in the park every afternoon.

Place the possessive adjective after 'Mary' because they are her 'dogs'; the dogs belong to Mary.

Login practices the joga withyoga in his guru's apartment before the sun rises.

Will nowadays works nervously works on her computer's in her office at late at night.

All the family members give a book to their neighborhoodurs in the garden allevery year's in July.

I'm not 100% sure what you are trying to say here. Do you mean to say that each member of the family gives a book to their neighbours in the garden every year?

The students slowly walk return in theed back to school after their break.

Mary dog's runs after her ball in the parkplays fetch with her dog every afternoon. in the park.

Login practices the joga withyoga in his guru's apartment before the sun rises.

Will nowdays nervously works on her computer's in her office at late night.

Nowadays, Will stays at their office 'til late at night, working on the computer.

All family members give a book to the neighborhood in the garden all year's in July.

I'm not sure on the intent of the piece.