求翻译：约翰必须履行诺言将清理花园所提供的50英镑，无偿的支付给他的儿子,比尔和他的隔壁邻居,安，约翰承诺支付50英镑作为给他清理花园的人的报酬，意图明确，就是想他通过提供报酬的方式吸引人为他清理花园中的垃圾。他的儿子和他的邻居旅行了相应的义务将花园里的垃圾清理干净，而且时间上清理花园是在约翰给出承诺之后完成的。这样就构成了一个对价。合约成立，一方已完成相应的义务，另一方就要兑现相应的承诺。是什么意思？

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John must fulfill its promise to clean up the garden, and the £50 free to pay him, the son of bill and his next door neighbor, John, and the commitment to pay 50 pounds to his clean as the people of the garden, it is clear that he would like to pay by providing an attractive way for him in the garde

John will have to fulfill the promise to clean up 50 pounds which the garden will provide, free payment for his son, Bill and his next-door neighbor, peaceful, John pledged pays human's reward which 50 pounds achievement will give him to clean up the garden, the intention is clear about, will be tho

John must promise to clean up the garden provided by 50 pounds, unpaid payments to his son, Bill, and his next door neighbor, Ann, John promises to pay 50 pounds as he cleaned the garden people pay intention clear, is the way he provides rewards to attract his clean up garbage in the garden. His son

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