这句话单独做为一个句子的话,肯定是有语法问题的,因为引导一个问句应该要有一个助词,应该改为How often do your parents go shopping?但是如果做为一个句子中的一个成分的话,就不会有语法问题了,举个例子:I want to know how often your parents go shopping....
How often是个词组,是提问“多久一次”的提问词。比如:He goes to school everyday.我每天都上学。那么问的时候怎么问呢?很简单,不知道的部份是everyday,用how often代替放最在前面,然后把剩下的he goes to school改成一般疑问句:does he go to school。合并...