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Vog (volcanic fog) is a form of air pollution. It`s made of carbon dioxide, water vapor and sulfur dioxide. That last one being most important.

Why did the author use "being" instead of "is"?

http://transcripts.cnn.com/TRANSCRIPTS/1805/09/sn.01.html

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I think that these transcriptions are probably produced automatically, using voice recognition: maybe humans do carry out a cursory check, but lots of grammatical errors get through.

You are right that the sentence as it stands is incorrect, and that it could be fixed by replacing being by is, so the final sentence is

That last one is most important

For an automated transcription, mistaking is for being just isn't going to happen: it's far more likely that there is a mistake in the punctuation. That final sentence is not actually a sentence: it is a non-defining participial clause, and as such it should be separated from the first sentence by a comma or a dash, not a full stop. This is what should actually should be:

Vog is a form of air pollution. It`s made of carbon dioxide, water vapor and sulfur dioxide, that last one being most important.


Note that, when we have a group or list of things and then wish to identify the superlative, we place the in front the superlative. For adjectives that don't form a superlative, we put the most in front of the adjective. See meaning 1 in Merriam-Webster. Without the, most has meaning 2 to a very great degree, and in British English is quite formal.

The final clause of this sentence therefore means "this last one being very important". Following after the list, it makes more sense if we insert the before most, to identify the superlative from the list.

Vog is a form of air pollution. It`s made of carbon dioxide, water vapor and sulfur dioxide, that last one being the most important.

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    It could even be punctuated with a dash: It`s made of carbon dioxide, water vapor and sulfur dioxide – that last one being most important. – J.R. Jun 12 '18 at 8:55
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    I think the can be omitted there since it has no further word like 'the most important thing' I'm not sure that if you put the article, which noun it will apply to! @javalatte – Maulik V Jun 12 '18 at 10:04
  • @MaulikV: I agree that it is grammatically correct without the and have updated my answer to explain why I think the is required in this context. The amended phrase is grammatically correct without thing. You would not normally say "this last one being the most important one": the final one is removed by ellipsis. en.wikipedia.org/wiki/Ellipsis_(linguistics) – JavaLatte Jun 14 '18 at 3:19

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