关于真实条件句的问题

关于真实条件句的问题
You______(get)a parking ticket if you leace your car there,sir.If you______(stay) for the night,you_______(have to) put it in the hotel garage.
标准答案是：If you are staying for the night,you will have to put it in the hotel garage.
我的答案是：If you stay for the night,you will have to put it in the hotel garage.
不是说主句用将来时,从句用一般现在时的吗?