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In the GMAT manhattan SC book in C2, Problem set excercise 7

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In the GMAT manhattan SC book in C2, Problem set excercise 7 [#permalink] New post 12 Aug 2010, 00:52
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In the GMAT manhattan SC book in C2, Problem set excercise 7 states

After the fact that the test format was changed, scores subsequently dropped more than a 25% decrease.

Solution: After the test format was changed, scores dropped by more than 25%.

I understand all the changes but one.

Fist they changed the format, then the scores dropped. Why don't they use the past perfect:
After the test format had changed, scores dropped by more than 25%
Or if it is to obvious: After the test format changed, scores dropped by more than 25%

When do you use the WAS + Past Participle?

thanks
blackcrow
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Re: standard error, needed some guidance [#permalink] New post 12 Aug 2010, 01:41
The past perfect is used to show a sequence of actions that were taken in the past.
In your example, there is no need to show the sequence of the actions as it is very obvious that the test format changed first and that change led to drop in scores.

WAS + Past Participle is used in passive mode.
See example below:
Active - Sam repaired the car.
Passive - The car was repaired (by Sam).

Hope this is clear to you.
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Re: standard error, needed some guidance [#permalink] New post 12 Aug 2010, 02:03
thanks

clears it up completely
Re: standard error, needed some guidance   [#permalink] 12 Aug 2010, 02:03
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In the GMAT manhattan SC book in C2, Problem set excercise 7

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