Are the sentences semantically correct?

Nat I might have sed doubledash or even comma; also the final "s" might be deleted

Yes, compulsive I am

What about this:

"The 'horseshoe' arrangement means that the classroom becomes a more intimate place. This gives students more potential for sharing feelings, ideas and information. It is all so essential for classroom discussion."

I am not sure what "all" refers to.

URL: http://able2know.org/topic/357084-1#post-6318633

vNat I'd go the comma

S'pose feelings, ideas and information

Oh I see. OK, thank you dalehileman! You are very helpful.

Well Nat! My entire week has been improved

...unless somehow I'm wrong

Dalehileman, could you tell me what kind of article should I used in the following examaple?

The/A seating arrangement depends upon the activity involved.

Personally, I would choose "the".

"The" is more specific, the implication being a particular arrangement for a predetermined meting; whereas "A" is more general, implying almost any arrangement anywhere at any time