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Who (which student)is the tallest in your class?
3、who/what/which作主語時，通常按第三人稱單數(shù)對待。
例如：
Who is knocking at the door?
4、What is sb.?是問職業(yè);Who is sb.?是問姓名或者與某人的關(guān)系。
5、how many/how much/how long/how soon/how often/how many times/how far/how old等詞的用法區(qū)別。
How many+可數(shù)名詞復(fù)數(shù)/how much+不可數(shù)名詞(都是問數(shù)量)
how long：問一段延續(xù)的時間有多長，回答用for+一般時間或者since+點時間。
how soon：問某事過多久將會發(fā)生，回答用in+一般時間。
how often：問某一動作重復(fù)發(fā)生的頻率或間隔的時間，回答用three times a day.
how many times：對動作的次數(shù)提問，回答時用once/twice等詞。
how far：對路程、距離進(jìn)行提問。
how old：對年齡進(jìn)行提問。
例如：
1)There are fifty students in our class.
How many students are there in your class?
2) This shirt is twenty-five yuan.
How much is this shirt?
3) My uncle has taught English for twenty years.
How long has your uncle taught English?
4) I go to the cinema once a week.
How often do you go to the cinema?
5) It is about three kilometers away from your school to our hometown.
How far is it from our school to your hometown?
6) Jim will come back in three days.
How soon will Jim come back?
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