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Here is a rule that I took from Manhatten GMAT: Do not use a comma before "and" to separate two verbs that have the same subject. Wrong: Earl walked to school, and later ate his lunch. Right: Earl walked to school and later ate his lunch.
Now regarding the following question:
Aerugo, also known as verdigris, is the green "bloom" visible on many copper items, and is produced, like iron rust, over the course of time by the exposure of the metal to the oxygen in the atmosphere. a) visible on many copper items, and is produced b) that is visible on many copper items, and which produces c) visible on many copper items, and produces d) that is visible on many copper items, and that produces e) which is visible on many copper items, and which is produced
Answer A) is correct. However:
In my view you can break down the sentence as follows: Aerugon [...] is the green "bloom", and is produced [...]
As you can see, the two verbs "is" have the same subject "Aerugon" and hence the comma is placed incorrectly.
Can someone please explain why Answer A) is still considered correct?
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That's a good general rule to follow, but like most general rules, it has exceptions. (I'd say that *every* grammar rule has at least one exception, but maybe there's an exception to that! :wink:)
Basically, it's almost always okay to add a comma for clarity, especially when there are many pieces to coordinate. I don't know if I would put a comma there, but it's not enough of an offense to make us throw out the whole answer choice. In fact, the only comma offense I can think of that would make me cross an answer off would be a comma splice--the use of a comma to separate two independent clauses. (I like pie, it is tasty.)
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This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Verbal Questions Forum
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