以上如果是问句:How long are your parents going to be away for?或How long are your mom and dad going away for?如果不是问句:Your parents will be away for a couple days.或Your parents will be gone for a ...问题是这样的（）are your parents away?How many days are your parents away?How long are your parents away?都可以的, 如果是要问几天就第一个, 如果离开较久或没一定时间就第二个.