 In other words, the contract comes into being when the agreement is entered into, but the requirement of performance kicks in only if and when the condition is satisfied.In the example of a father who promises his daughter that he will buy a car for her if she passes her examinations, the contract forms when these terms are agreed to, but the father's obligation to buy the car sets in only if his daughter passes her examinations.Usually a suspensive condition must be fulfilled within a reasonable period of time, though sometimes the parties attach a period of time to the condition.