| A | B |
|---|
| Revocation | John offers to sell his Nike shoes to Kevin for $150 but prior to Kevin accepting John says he has a better offer and is taking back his offer. |
| Counteroffer | John offers to sell his Nike shoes to Kevin for $150 but Kevin only is willing to pay $125. |
| Death | John offers to sell his Nike shoes to Kevin for $150 and Kevin is willing to purchase them on Friday. Kevin is killed in an automobile accident on Thursday. |
| Rejection | John offers to sell his Nike shoes to Kevin for $150 but Kevin is not interested and says no thank you. |
| Insanity | John offers to sell his Nike shoes to Kevin for $150 but Kevin has a legal guardian that has to agree to all his contracts due to a mental capacity declaration from the court system. |
| Expiration of Time | John offers to sell his Nike shoes to Kevin for $150 and requires answer with 3 days, but Kevin does not respond to him for 5 days. |
| Destruction of the subject matter | John offers to sell his Nike shoes to Kevin for $150 and Kevin accepts to buy them on Friday. On Thursday, John wears them in a game and tears the sole. |
| Offeror | Ted has asked Brenda if she would like to buy his artwork for $500. Who is Ted? |
| Definite and Certain | Ted has asked Brenda if she would like to buy his artwork for $500. What if Brenda does not know which of Ted’s 20 different artworks that he is talking about? |
| Mirror Image Rule | Ted has asked Brenda if she would like to buy his artwork for $500. What if Brenda accepts all the terms of agreement as stated? |
| Unilateral Acceptance | Ted’s painting was stolen. He posted a reward notice for $500 to the person who returned the painting. What if Brenda found the painting and returned it to Ted, and Ted gave Brenda $500? |
| Bilateral Acceptance | Ted has asked Brenda if she would like to buy his artwork for $500. What if both Ted and Brenda agree to the terms and promise to exchange the artwork and money on Friday? |
