I want to write about different things I have in my room. Do I have to use a/an before every single noun?
For example: In my room I have: a sofa, an armchair, a firelace, a table, a window. There is a carpet, a shelf, a lamp, a tv...
Well..........yes AND no. If you are simply and rapidly stating the contents of your room (or any container or area), it would not cause a major reaction from the listener/reader to omit the article, except for the first item regardless of whether subsequent items would require "a" or "an". But if you have an ample supply of "a's" and "an's", use them.