Noun Modifier Vs Adverbial Modifier

[PawanG236]

Dear Madam/Sir,
I am studying GMAT Verbal from MPrep Sentence Correction Guide.

I did not understand difference between Noun Modifier and Adverbial Modifier.

Is this difference context driven or rule driven ?

For Example,
1. Prepositional Phrase can be Noun Modifier or Adverbial Modifier. How can I identify if the prepositional phrase is Noun Modifier or Adverbial Modifier.

2. I thought Opening modifier with present particle is always Noun Modifier, but sentence correction guide says present participle with comma can be Adverbial Modifier too. (page number 63 of 6th edition SC Guide)

Example of Adverbial Modifier given in SC Guide is
"The ENGINEER FIXED THE PROBLEM, earning himself a promotion.

So, In a sentence
Completing very difficult project, The Engineer got the promotion.
"Completing very difficult problem" is Noun Modifier or Adverbial Modifier.

If second sentence is Noun Modifier, then what differentiates Noun Modifier or Adverbial Modifier ?

Thank You in Advance.
Regards,

[RonPurewal]

hi,
questions about strategy guide material belong in the "MPrep non-CAT verbal" folder.

thanks.