Reply to "To Submit/Submitted"

David, Moderator posted:
 Sentence (1) does not use extraposition. It could be used to answer the question "What is it for?", where "it" refers to something established in the context.
 

Hi, David,

Is there a chance to read 'it' in '1' as introductory it?

If that is not so, then kindly explain with an example what you mean by "It could be used to answer the question "What is it for?", where "it" refers to something established in the context." 

Thanks.

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