How long/How often/How soon/How far用法
一、how long的用法
how long有以下两个主要意思：
1. 表示多长时间，主要用来对一段时间(如three days, four
weeks 等)提问。
一般与for连用，完成时态。
如：
A：How long did he stay here? 他在这儿呆了多久?
B：About two weeks. 大约两个星期。
A：How long does it take to get to London from here? 从这里到伦敦要多长时间?
B：At least ten hours. 至少要10个小时。
2. how long提问单个事物本身的长短，与距离无关。
表示某东
西有多长。
如：
A：How long is the river? 这条河有多长？
B：About 500 km. 大约500千米。
二、how long意为“多长”，提问事物的长度。
使用时要注意与how far
的区别。
how far强调某两个地点之间的距离，from…to。
回答时表示两地间距离的短语常见的有five kilometers（五千米）, a few miles（数英里）, ten minutes’ walk（十分钟的步行路程）, three hours’ ride（三小时的车程）等。
在疑问句中一般会出现两个地点。
三、how often的用法
how often 指每隔多久，主要用来对频度副词或状语(如：once a
week, three times a month 等)提问。
如：
A：How often does he come here? 他(每隔)多久来一次?
B：Once a month. 每月一次。
A：How often do you visit your mother? 你多长时间看你妈妈一次?
B：Once a week. 一周一次。
三、how soon的用法
how soon 指再过多久，主要用来对表示将来的一段时间(如：in an hour, in two weeks 等)提问。
如：
A：How soon will he be back? 他要多久才回来?
B：In an hour. 1 小时以后。
A：How soon shall we know the results? 我们多久能知道结果? B：I don’t know. 我不知道。
How far 和How long 的区别
A:持续多长时间（多久）
how long
How long have you been here?
For five months.
长度（多长）
how long
How long is the bridge?
It’s 500 metres.
距离（多远）
how far
How far is it from here to the zoo?
It’s 6 kilometres.
四、练习题
对划线部分提问
1、It took me three hours to do my homework.
__ __ __ __ __ __to do __ homework? How long did it take you/ your 2、He will come here in ten minutes.
___ ___ will he ___ ____? How soon/ come here
3、Mary visits her parents once a week.
____ ____ ____ _____ ____ her parents? How often does Mary visit 4、It is five miles from the bookshop to the bus station.
————from bookshop to the bus station? How far is it
5、There are two apples in my bag. How many/are there your ___ ____ apples ___ ___ in ___ bag?
6、The line is about six meters . How long
___ ___ is the line?
7、“______will he leave here?”“He will leave here in a month”
A. How often
B. How long
C. How soon
D. How many times
8. “____does he watch TV”“Once a week.”
A. How long
B. How soon
C. How often
D. How many
9． I don’t know_______ he will get here.
A. how long
B. how soon
C. how often
D. how many
10. “_____does he take this medicine?”
“Twice a day.”
A. How soon
B. How long
C. How much
D. How often
11. “_______have you been at this factory?”
“I have been here since 1993.”
A. When
B. How long
C. How often
D. What time a
12. “________can you finish this work?”
A. How often
B. How soon
C. How long
D. How far
13. “__________ will he stay here?”
A. How many times
B. How often
C. what time
D. How long
14. _______does your sister write to your parents?
A. How many
B. How often c. How long D. How far
15. ________does it take you to finish you homework every day?
A. How long
B. How often
C. How soon
D. How much
答案：1、How long did it take you /your 2、How soon/come here
3、How often does Mary visit
4、How far is it
5、How many /are there /your
6、How long
7、C
8、C
9、B 10、D 11、B 12、B 13、D 14、B 15、A。