1. how often 对频度副词sometimes, usually, once a month, three times a week等提问2. how long 对时间长短提问；也可以对某物体的长度提问3. how soon 对未来的时间提问4. how many times 对具体数字表示的数字提问 e.g 1. How often do you have PE in a week ? Twice a week. 2. How long does the movie last? It lasts about 90 minutes. How long is your ruler? It's 20 CM long. 3. How soon will your dad come back? He will come back home in 3 days. 4. How many times have you been to Beijing? I've been there 3 times.
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