OG12 SC41菜鸟求问

大北冥星辰 · 发表于 2011-10-3 22:21:53

41. To develop more accurate population forecasts,
demographers have to know a great deal more than
now about the social and economic determinants of
fertility.
(A) have to know a great deal more than now about
the social and economic
(B) have to know a great deal more than they do
now about the social and economical
(C) would have to know a great deal more than they
do now about the social and economical
(D) would have to know a great deal more than they
do now about the social and economic
(E) would have to know a great deal more than now
about the social and economic
这道题OG的解释里边有一个解释是 conditional verb is needed，这个conditional verb是个啥意思？
或者这个would have toCDE项的那些能帮我解释一下么，谢谢~

大北冥星辰 · 发表于 2011-10-3 22:26:45

顶起求解释

大北冥星辰 · 发表于 2011-10-3 22:27:11

谁能帮帮我

大北冥星辰 · 发表于 2011-10-3 22:27:33

现场等

大北冥星辰 · 发表于 2011-10-3 22:30:30

有人吗？

大北冥星辰 · 发表于 2011-10-3 22:31:05

有打酱油的回复一下也好啊

大北冥星辰 · 发表于 2011-10-3 22:58:13

？？？

Aviva0307 · 发表于 2011-10-3 23:34:39

这个conditional verb是个啥意思？条件语气下的动词，应该就相当于虚拟语气吧。

C的错误在于economical节省的，应该是economic经济（学）的；

E是more than后的比较错，本意是 "应该知道的would have to know"跟"现在知道的they do(=know) now"比较,they do 不能省。

zeng614 · 发表于 2011-10-9 00:45:37

不定时，有将来的意思，所以用would更贴切

zj_stpaul · 发表于 2011-10-9 01:25:58

conditional verb，指的是动词前面加上一些conditional helping verbs，如would, should, could

conditional的意思是“有条件下（才发生的）”，就是存在possibility

用一般现在时，除了表示现在的状况，还表示真理，general truth，和一定会发生的情况（with no uncertainty)

如果存在some uncertainty,就用can/may+verb 或者could/would/should+verb 但是后者的不确定性更大

建议LZ看看manhattan语法中关于时态的那一章，说的很好

OG12 SC41菜鸟求问

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