howoften通常表示多長(zhǎng)時(shí)間一次，主要用來(lái)對(duì)頻度副詞或者狀語(yǔ)提問(wèn)。也可用來(lái)提問(wèn)某動(dòng)作或狀態(tài)發(fā)生的頻率。

1.how often指“每隔多久,多久一次做...”，主要用來(lái)對(duì)頻度副詞或狀語(yǔ)(如：once a day, three times a week 等)提問(wèn)。

How often does he come here? 他(每隔)多久來(lái)一次?

Once a month. 每月一次。

How often do you visit your mother? 你多長(zhǎng)時(shí)間看你媽媽一次?

Once a week. 一周一次。

2.用來(lái)提問(wèn)某動(dòng)作或者狀態(tài)發(fā)生的頻率，指的是“一段時(shí)間內(nèi)發(fā)生了幾次活動(dòng)”。

How often do your parents let you to watch TV.你的父母多久讓你看一次電視？

3.注意和how soon,how long的區(qū)別，how soon主要是對(duì)“多快，多久”提問(wèn)？

How soon will you come back？how long是就" 一段時(shí)間"提問(wèn)的，how long have you lived here?

4.對(duì)于how often 的句型回答，一般有這些詞表示頻率：once,twice,three times,four times,everyday等等。