英语.how often do they stay uplate 为什么助动词

英语.how often do they stay uplate 为什么助动词 How long do they stay in Beijing? How often do they exercise什么意思 How often do you write to your father?DO 在句中是不是助动词、无意义? How often do they do to school by bike? 1.How often do they drink orange?H____ ever 2.How often do y how long did you stay here how often do his parents let him 英语how often do you eat out? How often do they have it checked? 语法问题 How often do they eat in a week? They are c_____ frends.they often stay how long do you stay at this factory 为什么不对?