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The method, used in this study, shows the climate change effects, which can be applied to other scientific studies.

Question: Is it correct not to place "which is" is after first comma and before used? if yes, when will it be grammatically correct to remove "which is" after comma? for example; "which can be" after third comma above can be deleted in this situation?

I want to understand if after comma I can use past participle of verb without adding which+to be.

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  • "is showing ", perhaps?
    – V.V.
    Feb 25, 2016 at 20:13

2 Answers 2

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1) The method which is used in this study shows the climate change effects, which can be applied to other scientific studies.

2) The method used in this study shows the climate change effects, which can be applied to other scientific studies.

Sentence 1 shows the sentence with which. This is a restrictive adjective clause, sometimes called a relative clause. In other words, it modifies the subject (like an adjective). It is essential information specifying the exact method and not separated with commas from the rest of the clause. Adjective clauses of this type may be formed with which, who, or that.

Sentence 2 is the same, except we have dropped the which is, forming a reduced relative clause. This is grammatical.

Such clauses may be reduced when they are modifying the subject. They should not be used after the main verb. So, the third clause cannot be reduced.

I would rewrite the entire sentence as:

The method used in this study shows the climate change effects and can be applied to other scientific studies.

For more information, look for Relative Clauses and Adjective Clauses.

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  • @Eli Please check the edited answer. Commas are not necesary in the first clause. Feb 25, 2016 at 20:55
  • @Eli In addition, I did not address the second clause. I would rewrite it as "and can be applied" with no commas. Feb 25, 2016 at 20:58
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Like the "which" clauses from which they are derived (by WHIZ-deletion), such expressions can be restrictive (without a comma) or unrestrictive (with a comma).

So

The method used in this study ...

specifies that the method we are talking about is the one used in this study.

The method, used in this study, ....

talks about a method, and incidentally remarks that it is used in this study.

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