Question

6．The plane will take off in more than half an hour．（劃線提問）
Howsoonwill the plane take off？

Answer 1

分析 飛機(jī)半個(gè)多小時(shí)后會(huì)起飛．
飛機(jī)多久會(huì)起飛？

解答 答案：How soon，劃線部分 in more than half an hour．表示多久之后，故提問用how soon還要多久，故答案是How soon．

點(diǎn)評(píng) how long意為"多久、多長(zhǎng)時(shí)間"，主要是對(duì)一段時(shí)間進(jìn)行提問，答語(yǔ)通常是（for）three days/weeks/months等時(shí)間段，它可用于各種時(shí)態(tài)．

-How long were you not at school last year？去年你多久沒上學(xué)？
-About two weeks．約兩周．
how soon意為"還要多久"，是對(duì)從某個(gè)基本時(shí)間到將來(lái)某動(dòng)作結(jié)束或某動(dòng)作發(fā)生這段時(shí)間提問，常用在一般將來(lái)時(shí)態(tài)的句子中，其答語(yǔ)通常是"in+一段時(shí)間"．
-How soon can you finish the work？還要多久你能完成這項(xiàng)工作？
-In half an hour．半小時(shí)后．