Explain the rules relating to offer and acceptance with decided cases.

1. 1 · Open in two lines. Agreement is the first essential of a contract. It is formed when a valid offer meets an unconditional acceptance.
2. 2 · Define offer and give its rules. Definite, communicated, with intention to be bound; may be to one person or the world (Carlill).
3. 3 · Offer vs invitation to treat. Displays (Boots; Fisher v Bell), adverts (Partridge v Crittenden), information (Harvey v Facey).
4. 4 · Termination of offer. Revocation (Byrne v Van Tienhoven), rejection, counter-offer (Hyde v Wrench), lapse, death, failed condition.
5. 5 · Rules of acceptance.
   • Unconditional (mirror image); communicated; silence is not acceptance (Felthouse v Bindley).
   • Postal rule (Adams v Lindsell); instant methods on receipt (Entores).
6. 6 · Draw the flow. [Diagram: offer → reaches offeree → unconditional acceptance → communicated → agreement]
7. 7 · In Sri Lankan business. Supermarket checkout; a buyer's email changing delivery terms is a counter-offer.
8. 8 · Close in one line. Offer and acceptance give agreement; the other essentials make it a contract.

Scoring tip: Every rule needs a case name. One line of facts per case is enough.