og12sc83细节问题

imddung

关于时态得问题


In 2000, a mere two dozen products accounted for
half the increase in spending on prescription drugs,
a phenomenon that is explained not just because of
more expensive drugs but by the fact that doctors are
writing many more prescriptions for higher-cost drugs.
(E) in attributing a food allergy as the cause of
criminal or delinquent behavior,


(A) a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing
(B) a phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing
(C) a phenomenon occurring not just because of drugs that are becoming more expensive but because of doctors having also written
(D) which occurred not just because drugs are becoming more expensive but doctors are also writing
(E) which occurred not just because of more expensive drugs but because doctors have also written

这题选择A, 我对选择答案没有疑问。但是有一个点是 doctors are writing 这个问题

present progressive is the action on goin gin the present time frame
这题通过逻辑意思，我该怎么判断doctors 是用are writing 而不是用present perfect：have written?

这个事件是发生在 2002， a phenomenon is explained用的是present tense， 在这里，是不是phenomenon，theory, secintific rearch都用present tense? 是否代表后边得都要用present tense?

我怎样判断doctor至今到现在还在wrtting而不是 have written?

谢谢各位帮忙

Knightll

好问题

我当初也在纠结这个时态，但是选项没有做出split，几乎都是现在进行时...我只能说我们要去分析为什么要现在进行时是对的了= =


在我看来，我觉得是现在的人对于过去发生的事情给出了现在的解释

are writing这里的意思就是说医生在现在的这个时间段来讲，还是在写很贵的处方

就是说过去医生写了很贵的处方，现在还在写


如果用的是完成时态，你表达不出这个present time-frame的说法（或者说，即使你表达了，这个完成时态也只是穿越了部分的现在时间段，相反的，现在进行时穿越的就是整个的现在时间段


OG上类似的例子：
Last week local shrimpers held a news conference to take some creditfor the resurgence of the rate Kemp's ridley turtle, saying that theircompliance with laws requiring turtle-excluder devices on shrimp nets isprotecting adult sea turtles.



关于这题的时态ron的回答：


first, note that this is a non-issue in this problem, as you are not required to make a decision about tenses. (there are only two choices that are not in the present progressive -- (a) and (c) -- and both of those have subject-verb disagreement.)


second, no, this construction doesn't require the present perfect (...and you know it doesn't, because the official answer doesn't have it).
the present perfect gives the impression that something has happened in the past, in a way that
* has persisted up to the present,
* still affects the present even though it's over, OR
* is over, but could happen again.


if the sentence is meant to emphasize that the action is actually ongoing IN the present timeframe, then the present perfect is not the correct tense to use -- the present perfect (despite its name) does not necessarily indicate that the action continues through the present timeframe.
this is, in fact, the only main function of the present progressive (is/are -ING) tense, which is therefore an excellent choice for this sentence.

imddung

原来如此，遇到这种题目，还是要根据题意思，不过要反推一下，就能理解了。

感激啊！！

imddung

其实我一下就能limit down to A,B是因为一个小点:

svo, N +that
Svo, ..V + that

很多情况都是这样得。不是俺总结的，是xdf lily 老师讲得。
我觉得很有用哈。

Knightll

没太懂你的split？

能详细说下？

imddung

其实是一个固定得模式:

svo, N +that
Svo, ..V + that

怎么推出来得，好像是lily老师自己做了很多题目之后推出来得。就像og里面这一题。
还有prep08里面很多道题目,

1) 只要是画线部分在comma附近，选项中split有that和无that两种情况 就可以用此小点
2) 要看that 前面是否是Verb or Noun. 如果是得话
3)在看Verb or Noun前面是否有Comma

符合以上3点就可以了

waytousff

看不懂lz的3点是什么意思哦。能不能再用通俗易懂的话解释一下？
非常感谢！
其实我还挺纠结B的，觉得B的平行很漂亮啊。。。why。。。

jingjane

其实我想问这个题为什么不选B，看起来不是更平行么。