【正文】
? how soon 多久 問 in+一段時間 He can finish it in half an hour. How soon can he finish it ? how long 多久 問一段時間, 問物體的長短 He has lived here for a year. How long has he lived here? The desk is one meters long. How long is the desk ? how often 多久 (一次) 問頻率 I go to see my parents once a month. How often do you go to see your parents?