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标题: OG12-41 [打印本页]

作者: aman8da    时间: 2009-8-23 16:01
标题: OG12-41

41, To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic deterninants of fertility

B. have to know a great deal more than they do now about the social and economic

D.would have to know a great deal more than they do now about the social and economic

答案是D,请教为什么要用虚拟语气?


作者: lumanyu    时间: 2009-8-23 17:13
个人觉得突出了与now的情况的比较,强调了now的不足。
作者: chilinvision    时间: 2009-8-24 13:05

为了实现一个目的,而应该要怎么样。强调一种建议而用的虚拟语气

而且B选项中economic变成economical,改变了原意


作者: duducrystal    时间: 2009-9-1 21:38
up
作者: jyy529    时间: 2009-9-1 22:29
To develop more accurate population forecasts是一个没有实现的情况,不是现实,而是自己的假象情况,所以要用条件语气表现这种非现实
作者: lzj1209    时间: 2009-10-3 19:01
我觉得这里would不是虚拟语气的用法~
而是情态动词的用法~
表达了一种未来可能发生的事~
refer to a promised but uncertain future event~

作者: chenche8827    时间: 2011-3-28 19:08
是不是可以这样想呢?加上我们通常会用到的if then的句型,原句改为(if demographers want) to develop more accurate population forecsts,(then)they would have to know a 。。。。这是不是OG所说的虚拟语气的意思呢?是虚拟条件句没有用if来表达,用的是一个表目的介词短语。。




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