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The combination of and and therefore when connecting two independent clauses confuses me quite a bit.

I don't know how to write this sentence, and therefore I have to ask about it on the EnglishForward.com.

Or do I need the commas around the 'unnecessary' therefore?

I don't know how to write this sentence, and, therefore, I have to ask about it on the EnglishForward.com.

Thanks in advance.
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Frankly, I would not put any commas in.

At most, your first option is the one to go for.

From the point of comma usage, in your second sentence, you require the commas before and after "therefore", but not the one after "sentence".
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I would say that "and" is redundant in this sentence. It should read, "I don't know how to write this sentence; therefore, I have to ask..."
Feebs11, I think I need the comma before the "and", since I have two independent clauses. For example, if "therefore" wasn't there, and I had:

I don't know how to write this sentence, and I have to ask about it on the EnglishForward.com.

I would just have "IC, and IC'; I don't think you can't leave out the comma.

Spides, yeah, if I leave out the "and" then everything is easy Emotion: smile. However, I think the "and" makes the sentence flow a little bit smoother. Though omitting it would sound fine too, of course.

I know how to connect two independent clauses with a coordinating conjunction (and) and a conjunctive adverb (therefore) as long as I use them by themselves, but when I put them together, I get confused.

Thanks for the replies.