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先看几道中考题：
1. —____________ will you be away?
—In a couple of weeks. （2010年，山东滨州）
A. What time B. How soon
C. How often D. How long
2. —I wonder_______ you’ll water this kind of tree．
—Once a week．（2010年，江苏苏州）
A． how often B． how long
C． how soon D． how much
3. —Xiao Wang，__________ will it take to fly to Guangzhou？
—Sorry, I don’t know. （2010年，四川）
A. how far B. how soon
C. how many D. how long
分析：上面三道中考题的答案分别是：1.B；2.A；3.D。三道中考题是在考查how long, how soon与how often的用法。
英语中，这三个短语都有“多久”的含义，都可以用来对时间提问，但它们在实际运用中是有区别的。现分述如下：
一、how long表示“多长时间、多久”。当句中有for，since，from...to， all the morning等词来表示一段时间时，常用how long提问。如：
My English teacher has taught in our school for ten years. →
How long has your English teacher taught in your school？
His uncle has been a doctor since 2008. →
How long has his uncle been a doctor？
The summer lasts from May to July in China. →
How long does the summer last in China？
友情提示
1. how long也可以对take, spend之类动词后面表示“时间段”的宾语进行提问。如：
It takes me half an hour to go to school by bike. →
How long does it take you to go to school by bike？
2. how long还可以对物体的“长度”进行提问。如：
The river is about ten kilometers. →
How long is the river？
二、how soon表示“多久以后”。当句中有in no time, at once, very soon, before long, in...（过……之后），within... (在……以内)等时间状语时，用how soon提问。如：
He will be back in an hour. →
How soon will he be back？
We can finish the work within a week. →
How soon can you finish the work？
The train will arrive before long. →
How soon will the train arrive？
三、how often表示“每隔多久时间一次”。它用来对句中表示频度的时间状语，如every other day, once a week, sometimes等提问。如：
I write to my family once a month. →
How often do you write to your family？
I should take the medicine three times a day. →
How often should you take the medicine？
The bus comes every ten minutes. →
How often does the bus come？
友情提示
不要把how often 和how many times混为一谈。how many times是“多少次”，how often是“多久一次”。often指的是“频度”，即“单位时间内的次数”，或“每隔一段时间一次”，如果只问“几次”，就要用how many times了。试比较：
How often do you see a film？
你多久看一次电影？
How many times did you go to the cinema last month？
上个月你去过电影院几次？
牛刀小试
1. —______ will Ezhou-Huanggang Bridge be finished？
—In a few months.（湖北黄岗）
A. How soon B. How long C. How often D. How far
2. —______will it take you to get to the post office？
—About half an hour.（广西南宁）
A. How old B. How long C. How soon D. How often
3. —______do you write to your parents？
—Once a month.（甘肃）
A. How many times B. What time is it
C. How soon D. How often
4. —How often do you go to the library？
—______.（河南）
A. In a week B. For a week
C. Once a week D. After a week
5. —______will the rainy season last？
—About a month.（河北）
A． How often B. How soon C. How much D. How long
6. —______will you be back from Australia？
—In a few days.（安徽）
A. How long B. How often C. How soon D. How much time
7. —______do you watch TV？（宁夏）
—Sometimes.
A. When B. How often C. Why D. Where
8. —_______do you have PE lessons？
—Three times a week. （山东潍坊）
A. How long B. How soon C. How many D. How often
9. — _______ can we get there？
—In five minutes. （山东菏泽）
A. How often B. How far C. How soon D. How long
10. —Can you tell me _______ you have been collecting shells？
—Since I was seven years old. （湖北襄樊）
A. how long B. how old C. how far D. how many
Keys:1-5 A B D C D 6-10 C B D C A
1. —____________ will you be away?
—In a couple of weeks. （2010年，山东滨州）
A. What time B. How soon
C. How often D. How long
2. —I wonder_______ you’ll water this kind of tree．
—Once a week．（2010年，江苏苏州）
A． how often B． how long
C． how soon D． how much
3. —Xiao Wang，__________ will it take to fly to Guangzhou？
—Sorry, I don’t know. （2010年，四川）
A. how far B. how soon
C. how many D. how long
分析：上面三道中考题的答案分别是：1.B；2.A；3.D。三道中考题是在考查how long, how soon与how often的用法。
英语中，这三个短语都有“多久”的含义，都可以用来对时间提问，但它们在实际运用中是有区别的。现分述如下：
一、how long表示“多长时间、多久”。当句中有for，since，from...to， all the morning等词来表示一段时间时，常用how long提问。如：
My English teacher has taught in our school for ten years. →
How long has your English teacher taught in your school？
His uncle has been a doctor since 2008. →
How long has his uncle been a doctor？
The summer lasts from May to July in China. →
How long does the summer last in China？
友情提示
1. how long也可以对take, spend之类动词后面表示“时间段”的宾语进行提问。如：
It takes me half an hour to go to school by bike. →
How long does it take you to go to school by bike？
2. how long还可以对物体的“长度”进行提问。如：
The river is about ten kilometers. →
How long is the river？
二、how soon表示“多久以后”。当句中有in no time, at once, very soon, before long, in...（过……之后），within... (在……以内)等时间状语时，用how soon提问。如：
He will be back in an hour. →
How soon will he be back？
We can finish the work within a week. →
How soon can you finish the work？
The train will arrive before long. →
How soon will the train arrive？
三、how often表示“每隔多久时间一次”。它用来对句中表示频度的时间状语，如every other day, once a week, sometimes等提问。如：
I write to my family once a month. →
How often do you write to your family？
I should take the medicine three times a day. →
How often should you take the medicine？
The bus comes every ten minutes. →
How often does the bus come？
友情提示
不要把how often 和how many times混为一谈。how many times是“多少次”，how often是“多久一次”。often指的是“频度”，即“单位时间内的次数”，或“每隔一段时间一次”，如果只问“几次”，就要用how many times了。试比较：
How often do you see a film？
你多久看一次电影？
How many times did you go to the cinema last month？
上个月你去过电影院几次？
牛刀小试
1. —______ will Ezhou-Huanggang Bridge be finished？
—In a few months.（湖北黄岗）
A. How soon B. How long C. How often D. How far
2. —______will it take you to get to the post office？
—About half an hour.（广西南宁）
A. How old B. How long C. How soon D. How often
3. —______do you write to your parents？
—Once a month.（甘肃）
A. How many times B. What time is it
C. How soon D. How often
4. —How often do you go to the library？
—______.（河南）
A. In a week B. For a week
C. Once a week D. After a week
5. —______will the rainy season last？
—About a month.（河北）
A． How often B. How soon C. How much D. How long
6. —______will you be back from Australia？
—In a few days.（安徽）
A. How long B. How often C. How soon D. How much time
7. —______do you watch TV？（宁夏）
—Sometimes.
A. When B. How often C. Why D. Where
8. —_______do you have PE lessons？
—Three times a week. （山东潍坊）
A. How long B. How soon C. How many D. How often
9. — _______ can we get there？
—In five minutes. （山东菏泽）
A. How often B. How far C. How soon D. How long
10. —Can you tell me _______ you have been collecting shells？
—Since I was seven years old. （湖北襄樊）
A. how long B. how old C. how far D. how many
Keys:1-5 A B D C D 6-10 C B D C A