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In astronomy the term "red shift" denotes the extent to which light fr

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Intern
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Joined: 26 Jul 2011
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Re: In astronomy the term "red shift" denotes the extent to which light fr  [#permalink]

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New post 07 Feb 2013, 09:55
Rarely the Passive voice is preferred over Active voice, this is a perfect example.

The Passive voice is required when the non- underlined portion of the sentence contains the person or agent performing the action preceded by the word "by".
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Re: In astronomy the term "red shift" denotes the extent to which light fr  [#permalink]

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New post 14 Mar 2017, 08:47
Hi sayantanc2k

Please can you explain why "has been" is required here ?

Thanks!
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Re: In astronomy the term "red shift" denotes the extent to which light fr  [#permalink]

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New post 16 Mar 2017, 05:55
hotshot02 wrote:
Please can you explain why "has been" is required here ?

Thanks!


Because, we need passive structure here - "light" cannot do the action of "shifting" them self towards another end of the light spectrum. In addition, "by the rapid motion" in the non underline portion intensifies the need for passive structure, hence "has been".

Hope this helps !!
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Re: In astronomy the term "red shift" denotes the extent to which light fr &nbs [#permalink] 16 Mar 2017, 05:55

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