请教OG46

atongmu · 发表于 2003-9-3 11:15:00

46. A study commissioned by the Department of Agriculture showed that if calves exercise and associated with other calves, they will require less medication and gain weight quicker than do those raised in confinement.
(A)    associated with other calves, they will require less medication and gain weight quicker than do
(B)    associated with other calves, they require less medication and gain weight quicker than
(C)    associate with other calves, they required less medication and will gain weight quicker than do
(D)    associate with other calves, they have required less medication and will gain weight more quickly than do
(E)    associate with other calves, they require less medication and gain weight more quickly than

在OG中大多数if条件状语从句结构都是:if+一般现在时，主句+一般将来时。这道题目是一个例外（解释中也明确指出主句一般现在时好于将来时），那位高手解释一下关于本题时态使用原因。

anchoret · 发表于 2003-9-3 13:51:00

if+一般现在时，主句+一般将来时，也可以加一般现在时（通常用于不强调将来但强调惯常情况的时候）

alicely · 发表于 2004-10-18 17:39:00

if从句中，动词用一般现在时态

37. While some academicians believe that business ethics should be integrated into every business course, others say that students will take ethics seriously only if it would be taught as a separately required course.

(A) only if it would be taught as a separately required course

(B) only if it is taught as a separate, required course

(C) if it is taught only as a course required separately

(D) if it was taught only as a separate and required course（B）

(E) if it would only be taught as a required course, separately

Choice B is best: in sentences expressing a conditional result (x will happen if y happens), the verb of the main clause should be in the future tense and the verb of the if clause should be in the present indicative.

46. A study commissioned by the Department of Agriculture showed that if calves exercise and associated with other calves, they will require less medication and gain weight quicker than do those raised in confinement.

(A) associated with other calves, they will require less medication and gain weight quicker than do

(B) associated with other calves, they require less medication and gain weight quicker than

(C) associate with other calves, they required less medication and will gain weight quicker than do

(D) associate with other calves, they have required less medication and will gain weight more quickly than do（E）

(E) associate with other calves, they require less medication and gain weight more quickly than

alicely · 发表于 2004-10-18 17:46:00

if从句中动词时态的另外两例

146. A patient accusing a doctor of malpractice will find it difficult to prove damage if there is a lack of some other doctor to testify about proper medical procedures.

(A) if there is a lack of some other doctor to testify

(B) unless there will be another doctor to testify

(C) without another doctor’s testimony

(D) should there be no testimony from some other doctor（C）

(E) lacking another doctor to testify

Choice B incorrectly uses a future-tense verb (will be) in the if clause; the if clause must use the present tense if it is preceded, as here, by a result clause that uses a future-tense verb (e.g., will find).

151. If Dr. Wade was right, any apparent connection of the eating of highly processed foods and excelling at sports is purely coincidental.

(A) If Dr. Wade was right, any apparent connection of the eating of

(B) Should Dr. Wade be right, any apparent connection of eating

(C) If Dr. Wade is right, any connection that is apparent between eating of

(D) If Dr. Wade is right, any apparent connection between eating（D）

(E) Should Dr. Wade have been right, any connection apparent between eating

D, the best choice, deals successfully with four issues. It uses a present indicative verb form in the conditional clause. If Dr. Wade is right, in order to agree with the verb in the main clause, any connection is...coincidental.

snake37 · 发表于 2009-8-11 23:56:00

不是这么复杂啦，其实很简单的：
A.B很明显错了，对吧，associate应该是原型
C：and左右时态不匹配，过去时和将来时
D:现在时和将来时不匹配
E:现在时和现在时匹配

请教OG46

请教OG46

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