TRUE OR FALSE (Please also explain how each are used. Thanks!)

1. A pure obligation does not depend upon the fulfillment on the happening of a condition for it to arise.

2. Conditions are future but certain events the happening of which will give to the performance of an obligation.

3. When a suspensive condition happens an obligation that is attached to it is extinguished.

4. Real obligations require the performance of an act or a service.

5. Real obligations subject to a condition has no retroactive effects once the condition happens.

6. Loss a specific thing due to a fortuitous event extinguishes sustains the efficacy of an obligation.

7. The happening of a resolutory condition gives rise to the obligation to perform an obligation.

8. Potestative condition when in depends on the sole will of the creditor for its performance nevertheless sustains the validity of an obligation.

9. A term of period is a future but uncertain event.

10. Periods are agreed upon as a general rule to benefit only the creditor.