paes wrote:
Jadeja
Again you have given the right explanation what I was looking for. Thanks to catch my intention.
I was also looking explanation from comma + and structure point of view.
Now also, I am not clear when to put a comma before and AND when no need to put a comma before and.
If there is any general rule, link, please provide.
Yes, there is a general rule..
Use "X and Y" when X and Y are nouns or noun phrases.
Eg: I bought some apples, pears and oranges.
Use "X, and Y" when X and Y are two independent clauses.
Eg: Miguel took piano lessons for sixteen years, and today he is an accomplished performer.
The use of the comma would also apply when any of the seven coordinating conjunctions (and, but, or, nor, for, so, yet) join two independent clauses.
Notice in the next example that we do not use a comma before "and" because it does not join two independent clauses but merely joins two verbs:
Eg:
Miguel took piano lessons for sixteen years and today is an accomplished performer.
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Here in this particular question, the case is different. In the following sentence we need comma before AND because of the modifier(
particles that... explosion). The comma before AND suggests that the modifier has ended there.
Astronomers have theorized that the Big Bang governs the behavior of interstellar dust, particles that comprise the atoms and molecules created in the progenitive explosion, and persists in even the emptiest regions of space.
If we remove the modifier(
particles that... explosion) from the sentence, then we do not need the comma before "and" because it does not join two independent clauses but merely joins two verbs:
Astronomers have theorized that the Big Bang governs the behavior of interstellar dust and persists in even the emptiest regions of space.
Hope that helps...
