Actually, you don't need the comma in your first sentence.  Rebekah Send a noteboard - 23/04/2010 08:37:42 AM
		Rebekah Send a noteboard - 23/04/2010 08:37:42 AM
		
	 Rebekah Send a noteboard - 23/04/2010 08:37:42 AM
		Rebekah Send a noteboard - 23/04/2010 08:37:42 AM
		Suppose you have two independent clauses conjoined: "I like owlbears, and you like hobgoblins."  The comma is necessary, of course.
No. The "and" does the joining bit for you. You can have the comma if it's going to be said with a pause. Doesn't need to be there, though.
Or this: "Suppose that I like owlbears(,) and you like hobgoblins."
Or this: "Suppose that I like owlbears(,) and that you like hobgoblins."
"That" sounds yucky (technical term) in there. Not wrong, just ick.

How would you evaluate the use or lack of a comma in those three sentences?
The comma is optional in all of your examples. It depends on whether you want to add a pause in thought/speech or not.
		*MySmiley*
Outside of a dog, a book is man's best friend. Inside of a dog it's too dark to read. - Groucho Marx
	
	
	
	
	
Outside of a dog, a book is man's best friend. Inside of a dog it's too dark to read. - Groucho Marx
			I cast Summon Grammar Nazi.
	    
	         - 23/04/2010 02:24:27 AM
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			I think the first 2 are OK either way, but the third is wrong (essential clause). *NM*
	    
	         - 23/04/2010 03:44:10 AM
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			I like owlbears and you, like hobgoblins.
	    
	         - 23/04/2010 03:59:31 AM
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			I imagine someone speaking in a Tonto voice, with the sentence structured like that. *NM*
	    
	         - 06/05/2010 03:07:39 AM
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			Actually, you don't need the comma in your first sentence.  - 23/04/2010 08:37:42 AM
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	         - 23/04/2010 08:37:42 AM
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	     - 23/04/2010 08:37:42 AM
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	         - 23/04/2010 08:37:42 AM
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			Mmm, yes he does.
	    
	         - 23/04/2010 03:38:06 PM
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			Depends on the independent clauses.
	    
	         - 23/04/2010 04:58:27 PM
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			Not in American English, it doesn't.  - 23/04/2010 05:13:15 PM
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	         - 23/04/2010 05:13:15 PM
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	     - 23/04/2010 05:13:15 PM
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	         - 23/04/2010 05:13:15 PM
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			I actually like the "that" but I'm not Bekah.
	    
	         - 23/04/2010 03:01:37 PM
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			Depending on the inflection used...
	    
	         - 23/04/2010 03:26:26 PM
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			Fair point; so is knowing to whom you speak.  - 23/04/2010 04:04:30 PM
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	         - 23/04/2010 04:04:30 PM
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	     - 23/04/2010 04:04:30 PM
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	         - 23/04/2010 04:04:30 PM
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			except that is an improper use of a semicolon.
	    
	         - 23/04/2010 04:24:00 PM
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			If a comma is appropriate in the original supposition, then the semicolon is necessary here.
	    
	         - 23/04/2010 11:24:20 PM
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			but
	    
	         - 24/04/2010 03:03:22 AM
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			I believe it's treated like one.  The comma takes the place of the verb. *NM*
	    
	         - 24/04/2010 03:23:38 PM
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			Re: Fair point; so is knowing to whom you speak.  - 23/04/2010 06:33:58 PM
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	         - 23/04/2010 06:33:58 PM
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	     - 23/04/2010 06:33:58 PM
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	         - 23/04/2010 06:33:58 PM
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			Your pro-elf anti-hobgoblin prejudice has been obvious for some time, Marge.
	    
	         - 28/04/2010 02:41:41 AM
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			Hobgoblins killed my elf friend.
	    
	         - 28/04/2010 01:40:22 PM
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			Jesus built my hotrod.
	    
	         - 04/05/2010 05:38:02 PM
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			I think my friend was perfectly justified...
	    
	         - 04/05/2010 06:40:05 PM
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			So the truth comes out: Nothing more than interspecies homophobia.  - 04/05/2010 06:57:56 PM
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	         - 04/05/2010 06:57:56 PM
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	     - 04/05/2010 06:57:56 PM
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	         - 04/05/2010 06:57:56 PM
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			Dude.  You know sisters are off limits.
	    
	         - 05/05/2010 01:22:49 PM
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			So, what, they're supposed to die old maids?
	    
	         - 06/05/2010 02:57:46 PM
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			Of course not.
	    
	         - 07/05/2010 02:07:36 PM
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			Apologies for the delay.
	    
	         - 18/10/2011 02:48:00 PM
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			Necromancy is generally frowned upon.
	    
	         - 18/10/2011 03:00:05 PM
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			I was unaware of your response until yesterday, and wanted to acknowledge it.
	    
	         - 18/10/2011 03:14:12 PM
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			Dude, WTF! This thread is like a year and a half old
	    
	         - 18/10/2011 08:58:14 PM
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			No need for commas in either of the lats 3 examples. *NM*
	    
	         - 23/04/2010 03:02:38 PM
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			You have Latvian lats?  It's a sort of worthless currency for trading purposes. *NM*
	    
	         - 23/04/2010 04:46:07 PM
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			I tap three mana and cast Cancel. *NM*
	    
	         - 23/04/2010 05:26:17 PM
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			It won't work, the only way to banish the Grammar Nazi is with Text Messages
	    
	         - 23/04/2010 11:41:51 PM
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			You get...300 exposition points, a scroll of open/close quotes, and a direct object. *NM*
	    
	         - 24/04/2010 02:32:48 AM
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			Apparently someone also cast Necromancy (Resurrect Deceased Thread). *NM*
	    
	         - 18/10/2011 07:30:02 PM
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 *NM*
 *NM*