Question

how often，how soon，how long，how far分别表示什么意思，分别什么时候用什么提问，请举出例子

Answer 1

how often 就频率提问
how often do you water the flowers? Once a day.
how soon 就“多快，多久”提问
how soon will you come back? In three days.
how long 一段时间提问
how long have you lived here? For two years.
how far 就距离提问
how far can you throw the ball? Ten meters.

Answer 2

how often是对“频率”提问的：
eg: - How often do you have your hair cut? 你多久理一次发？
- Every two weeks. 每两周理一次。
how soon是“还要多久”的意思（多用于将来时态）：
eg: - How long will he come back? 他还要多久才能回来？
- In an hour. 一个小时。
how long是“持续多长时间”的意思：
eg: How long has the headache lasted? 你头痛持续多久了？
How long will the movie last? 这个电影要放多长时间？
how far是“多远距离”的意思：
eg: How far is the nearest post office?最近的邮件有多远？