Help me pls and elaborate it. Thank you tutors.

1. Discuss the difference between:

A. Contract of Sale and Contract to Sell

B. Sale by Sample, Sale by Description.

C. Sale or return and Sale on Approval

2. What is the effect of loss of the thing/object in a contract of sale?

3. Discuss the different kinds of delivery?

4. Who is an unpaid seller? Give an example using a situation/scenario.

5. What are the rights of unpaid seller?

Thank you, tutors!