who what which when where how后加不定式在句中可以做主語(yǔ)、賓語(yǔ)、表語(yǔ)等,但why后加動(dòng)詞原型,是特例:
1.主語(yǔ)
e.g.When to start has not been decided.
何時(shí)動(dòng)身還未決定.
2.賓語(yǔ)
e.g.He did not know whether to go there or not.
他不知該不該去那.
3.表語(yǔ)
e.g.The difficulty was how to cross the river.
困難在于怎樣過(guò)河.
e.g.The question was where to go.
問(wèn)題是去哪里?
4.雙重賓語(yǔ)
e.g.I can tell you where to get this book.
我能告訴你從哪搞到這本書.
e.g.I asked him how to learn English.
我告訴他怎樣學(xué)好英語(yǔ).
5.有時(shí)疑問(wèn)詞前可用介詞
e.g.I have no idea of how to do it.