Positive work:
1. Pushing a package across a long distance.
2. Raise a book to a higher level.
Negative work:
1. When a thing is raised, negative work is done on it by gravity.
2. When we walk, friction produces work.
Zero work:
1. Pushing a wall with no work.
2. Walking while carrying something.
Final answer:
Hence, the examples of (i) positive work (ii) negative work (iii) zero work are given above.