Ed,
 
Yes.  Same effect.  The example is a little tricky, I think.  Main idea in main clause is much like the idea in the first of two coordinated clauses, provided the appropriate adverb can be used.  There are parallels with the other kinds of subordinated clauses as well.  This is a very important concept when teaching the difference between the two kinds of clausal relationship.  The flexibility of language is based on these kinds of equivalences. 
 
Socrates is a man; therefore he is mortal.  (co-ordination [implication])
Because Socrates is a man he is mortal.  (subordination [why-cause])
Socrates is mortal because he is a man. 
Socrates is mortal for he is a man.   (subordination [why-reason])
 
I believe that with certain non-restrictive clauses the same kind of paraphrase utilizes the adverb 'moreover' with much the force of a conjunctive.
 
I was talking about a man, who was Socrates. (non-restrictive adjective)
I was talking about a man; moreover he was Socrates.  (co-ordination)
 
The conjunction 'although' is concessive.  The conjunction 'however' is actually adversative.  Thus the related co-ordinated sentences would be:
 
We wanted to go to the ball game, but we were late.  (co-ordination [adversative conjunction])
We wanted to go to the ball game; however, we were late.  (co-ordination [adversative adverb])
We wanted to go to the ball game; we were late, however.  (co-ordination [adversative adverb])

Although we were late, we wanted to go to the ball game.  (subordination [concessive])
We wanted to go to the ball game, even though we were late.  (subordination [concessive])
 
Whether a set of clauses are construed as concessive or adversative is driven by context.  Whether I decide to concede a point or simply state the two ideas as contrasting is a stylistic decision.  In either case the two points contrast.  The decision to concede a point is sometimes based on whether it has come up previously.  Of course, I can bring it up and concede it at the same time.  
 
Bruce

>>> [log in to unmask] 2/25/2004 11:29:53 AM >>>
   I know that there are members of this list who do not believe that the main idea in a sentence is generally located in the main clause (MIMC), but there are also members of this list who do believe so. My question is for the latter, and it is not a trick question.
     Some people I am working with have been trying to develop exercises similar to the "Alicia" passage that Wanda Van Goor presented at an ATEG conference. See:
http://home.pct.edu/~evavra/kiss/wb/G08/Mar/index.htm
These exercises are not easy to create, and the question has arisen — Does a conjunctive adverb have the same subordinating effect as a subordinate conjunction. MIMCer's would probably say that in a sentence such as

Although we were late, we wanted to go to the ball game.

the main idea is "we wanted to go to the ball game," because the "although" subordinates the "we were late." The KISS psycholinguistic model supports this in that the subordinate clause is, theoretically, held in working memory and chunked to the main clause.

But is the same effect achieved in

We wanted to go to the ball game; however, we were late.

Thanks,
Ed

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