Note i) there is no comma after "although" and ii) you can't say, "I didn't had ..."
A correct example would be: "Although I have no work to do, I should go to the office." This is non-ambiguous.
"While I have no work to do, I should go to the office." This is ambiguous.
You can't always use 'while' for 'although/though', or vice versa. But, as I said, in speech you can disambiguate by intonation and stress and prosody - all those things you don't have access to in writing.
Last edited by Raymott; 25-Sep-2011 at 09:59.
Last edited by rajan; 25-Sep-2011 at 11:48.
Last edited by rajan; 25-Sep-2011 at 12:03.
A contrast may come as a surprise, but the purpose of although is to indicate the contrast- any surprise is simply a reaction.