1.how long意为多长时间，主要用来对一段时间(如three days, four weeks 等)提问的。
例句：
How long have you been waiting?
你等了多久了？
How long did you spend on your homework?
你做家庭作业用了多长时间？
How long have you been in this game?
你干这行当多长时间了？
How long have you been in your present job?
你干现在这工作多长时间了？
How long have you been living in this country?
你在这个国家居住多久啦？
How long have you been employed at this job?
你受雇做这个工作有多久了？
How long does the journey usually take?
这段旅程通常需要多长时间？
How long have they been at war?
他们交战有多长时间了？
How long can a human being go without sleep?
人不睡觉能活多久？
How long have you lived around here?
你住在这一带有多长时间了？
How long were you in the queue?
你排多长时间队了？
How long he'll be able to do so is a moot point.
不知道他还能这样做多久。
How long will it take you to knit up this pattern?
你织完这个花样要多长时间？
How long will it take her to swim the Channel?
她游过英吉利海峡得用多长时间？
How long can you balance on one leg?
你单腿能站多久？
How long do you think this storm will last?
你看这暴风雨会持续多久？
How long will the fine weather hold?
好天气会持续多久？
How long have you been married?
你结婚多长时间了？
How long does it take to qualify?
需要多长时间才能取得资格？
2 how often意为每隔多久，主要用来对频率副词或状语(如once a week等)提问的。
例句：
How often do you use the bus?
你多长时间坐一次公共汽车？
How often do you go to church?
你多久去教堂做一次礼拜？
How often does he come here? —Once a month.
他(每隔)多久来一次?每月一次。
How often do you go to the cinema?—once a week.
你多长时间去看一次电影？—一周一次。
How often do you go to the theatre?
你多久看一次戏？
How often do you go riding?
你多长时间骑一次马？
How often do you exercise?
你多长时间锻炼一次？
How often do you go swimming?
你多久去游泳一次？
How often do you actually get a gift you really need?
你会多久收到一个你确实需要的礼物？
How often do you water these trees?
你多久给这些树浇一次水？
How often do you brush your teeth?
你多久刷一次牙？
How often do the buses run?
公共汽车每隔多久一趟？
3. how soon问多久以后做某事；多快；询问某个事情多久以后发生
常对 “in+一段时间 ”提问， 表示“多久之后”,对（从即时起）到将来某个时刻间的时间长短提问，回答通常为 in+一段时间。
How soon will you arrive here?-I will arrive here in 3 hours.
你多久以后能到达？三小时内。
How soon will you come back?
你多久回来?
How soon can you come up with the money?
你什么时候（多久）能拿出这笔钱？
How soon can you get here?
你什么时候能赶到这儿？
4. how far问距离上多远；到什么程度[范围]
How far is it to your house from here?
从这儿到你家有多远？
How far is it from here?
离这里多远？
How far is it to Malcy?
这儿离马尔锡有多远？
How far is it to the station?
到车站有多远？
How far is the airport from here?
机场离这儿好远？
How far can you throw?
你能扔多远？
You lived to tell the tale this time but who knows how far you can push your luck.
你这次算是逃过了一劫，不过谁知道你的运气还会持续多久呢？
How far have you got with that report?
你那个报告写得怎么样了？
How far can we trust him?
我们能够信任他到什么程度？
How far is human nature determined by biology?
人性在多大程度上是由其生理因素决定的？
It's still not clear how far the Russian parliament will go to implement its own plans
俄罗斯议院在实施自己的计划时到底会采取怎样的极端措施尚不明了
How far did the film tell the truth about Barnes Wallis?
影片讲述的巴恩斯·沃利斯的故事有多少真实的成分？
How far will members have progressed towards harmonising their economies?
各成员国在使彼此经济协调一致的进程上会有多大进展？
How far gone are you?
你怀孕几个月了？
牛津高阶英汉双解词典
说明偶尔也问时间。