She says that she’ll have to close the shop ________ business improves.
A.if | B.unless | C.a(chǎn)fter | D.when |
句意為:她說(shuō)除非生意好起來(lái),要不然這店得一直關(guān)下去。unless ="if" not(如果不,除非)其它選項(xiàng)不符合題意。
【考點(diǎn)定位】考查連詞。連詞unless意為“除非……如果不……”,“除了……”,多引導(dǎo)一個(gè)否定意義的真實(shí)條件句,有時(shí)也可引導(dǎo)非真實(shí)條件句。unless引導(dǎo)條件句時(shí),主要用于下列情況:(1)主句為肯定句。如: Unless I visit every bookstore in town,I shall not know whether I can get what l want.如果我不到城里每一家書店去看看,我就不知道是否能買到我想要的書。(2)主句為否定句。如: Unless you oil the motor regularly.it won’t run smoothly.要不是你經(jīng)常給發(fā)動(dòng)機(jī)上油。它就不會(huì)轉(zhuǎn)得那么順暢。 unless在意義上相當(dāng)于if...not,因此在有些場(chǎng)合中unless與if...not可互換使用。如:Unless I am mistaken.I’ve seen that man before.="lf" I am not mistaken。I’ve seen that man before.如果我沒搞錯(cuò),我以前見過那個(gè)人。但在有些情況下,二者不可互換使用。如:(1)當(dāng)unless引導(dǎo)非真實(shí)條件句時(shí),一般不可改用if...not。如:They couldn’t afford to live in such an expensive apartment unless they were rich.除非他們很富有,否則就住不起這么昂貴的公寓。(2)當(dāng)if引導(dǎo)名詞性從句時(shí),unless不可以代替if...not,因?yàn)閕f=whether(“是否”)。如: It is unimportant if he will not attend the graduation ceremony.他是否參加畢業(yè)典禮無(wú)關(guān)緊要。(3)當(dāng)unless作介詞(“除……以外”,“除非”)時(shí),if...not不能與其互換使用。如:Nothing will come out of it.unless(=except)disaster.這件事除了引起災(zāi)禍之外,不會(huì)有什么結(jié)果。
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