how的用法：
1.(指方式、方法)怎樣,怎么
How did you climb to the top of that building?
你是如何爬上樓頂的?
2.(指健康等情況)怎樣
How is Mrs.Smith?
史密斯太太身體好嗎?
3.(指數量、程度)多少
How many students are there in your class?
你班里有多少學生?
4.(表感嘆)多么
How I wish to have a long vacation these days!
這些天我多么希望去度一次長假啊!
5.(通常于can連用)(表理由)為何
How can you do such a thing to her?
你怎么能對她做出這種事來?
conj.
1.(用于間接陳述中,意義和作用與that相仿)
This is how we became acquainted.
我們就是這樣認識的.
2.【口】=however
n.
1.方法,做法[the S]
The book tells you about the how and the why of flight.
這本書告訴你飛行的方法和原理.
其他：
how long,how often,how soon三者都可以譯成“多久”.how long用來提問“多長時間”,對“一段時間的長短”提問時用,與延續(xù)性動詞連用；how often用來提問某動作或狀態(tài)發(fā)生的頻率,對“一段時間內發(fā)生了幾次活動”（always,usually,often,never或twice a day等表示頻度的詞或短語）提問時用；how soon用來提問某人要“多快”能做好某事,或某事要“多快”能完成,對“過多少時間（就能……）”（in短語）提問時用,常用于將來時.而how far意思是“多遠”,對距離提問時用.
eg:
How long did you stay there?
你在那兒呆多久?
How often do his parents let him watch TV?
他父母多久讓他看一次電視?
How soon will her husband come?
她丈夫多久會回來?
how many知識詢問數量,后跟名詞復數.
如：How many pencils do you have?
或：How many books are there in the bookshelf?
注意：people雖然它的復數形式不加s,但人可數,且肯定用are,用how many
如：How many people are there in your family?
how much才是問價格的,還可以問不可數名詞的含量?
如：How much water is there in the glass?是問杯子里有多少毫升的水?