1. What are the elements of obligation? Discuss fully each element.+

2. A executed in favor of B a promissory note for P10,000, payable after two years, secured by a mortgage on a certain building valued at P20,000. One year after the execution of the note, the mortgaged building was totally destroyed by a fire of accidental origin. Can B demand from A the payment of the value of the note immediately after the burning without waiting for the expiration of the term? What are the obligations of a debtor in obligations to give a generic or indeterminate thing?

3. Cite at least three instances where a person is made civilly liable for failure to comply with his obligations although he was prevented from doing so by a fortuitous event.?

JURISDICTION:PHILIPPINES. PLEASE INCLUDE ARTICLE NUMBER