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So I've got this sentence in my IELTS prep book:

The chart shows information about how many people worked from home, in the USA and UK, between 2005 and 2010.

The commas sound so weird. I would be grateful if somebody could explain what are they doing up there.

Actually, the following sentence looks similar but doesn't contain commas:

The chart highlights data about the amount of electricity which was consumed in India and Pakistan between 2004 and 2010.

What is going on?

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    Read up on "parenthetical commas". Good Luck. – Kris Sep 22 '19 at 12:13
  • Welcome to ELU. Read the FAQ here: english.stackexchange.com/help/asking – Kris Sep 22 '19 at 12:14
  • @Kris, well, I think I have: "If the interruption to the flow of the sentence is but slight, the writer may safely omit the commas." It seems to me that the interruption to the flow is kinda introduced by those commas up there. – sudoLife Sep 22 '19 at 12:28
  • Much before that, actually. Try to find "what is a parenthetical" in the first place. – Kris Sep 22 '19 at 12:30
  • Googling: parenthetical commas. Getting: But if a word or phrase provides necessary information, information that significantly restricts or limits the meaning of the sentence, do not place commas around it. Isn't that the case? We do limit the statistics quite a lot by providing the location. – sudoLife Sep 22 '19 at 12:33
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Personally, I would read the first sentence as indicating that the chart showed separately how many people worked from home in the UK, and also showed how many worked from home in the USA. If the first comma were omitted, I would expect to see a chart showing only the total from both countries combined.

The way the second example is written, I would expect to see only the combined electrical usage of the two countries. If I were describing a chart showing the electrical usage of each, I might say "which was consumed in India and in Pakistan..."

This may or may not be what the author intended, but I believe the meanings are clearer when commas are used in this way and that leaving them out entirely would change the meaning.

Commas are much more than mere optional style. The Panda famously, "Eats, shoots, and leaves."

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