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Run-on Setence

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by ankit0703 » Thu Jun 28, 2012 1:42 am
As seen on one forum:

I adopted two dogs, which weigh approximately 100 pounds each
or
I adopted two dogs, each of which weighs approximately 100 pounds
is not a run-on sentence, then you also understand why (e) is not a run-on sentence.

--

by contrast, if the sentence had contained "many of them", then it would be a run-on.
so:
I adopted two dogs, they weigh approximately 100 pounds each
is a run-on sentence (--> incorrect). for the same reason,
I adopted two dogs, each of them weighs approximately 100 pounds
and
A population of only 4 million people, many of them are members of hill tribes
would also be run-on sentences (--> incorrect).

Could anyone please explain the reason?
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by Kasia@EconomistGMAT » Thu Jun 28, 2012 1:58 am
The first two sentences you have posted are correctly connected:

I adopted two dogs, which weigh approximately 100 pounds each. - There is a comma and the pronoun "which." Thus the sentence is properly formed.

The second sentence "I adopted two dogs, each of which weighs approximately 100 pounds." is also correct for the same reason.

A run-on sentence is a sentence in which two or more independent clauses (i.e., complete sentences) are joined without appropriate punctuation or conjunction. This is the case in the next sentences:
I adopted two dogs, they weigh approximately 100 pounds each.
Only a comma separates these two independent clauses from each other and there is no logical connection between them. These two clauses could easily make two separate sentences.

The same is true about the other two sentences.
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