Having problems with "Sono".
I have been working on Italian for a few weeks now and I am already up to Level 9, but I am still having problems with understanding when "Sono" as the first word of the sentence is being used as a conjugation of the first person singular or third person plural. Is there a guide or description somewhere that can clear this up?
You can generally tell from the context and/or the adjectives following it. When in doubt in a real life situation, you can always ask.
If you hear someone say "Sono americano", he's talking about himself (americano = masc. sg.)
"Sono americana": she's talking about herself (americana = fem. sg.)
If they say "Sono americani" or "sono americane", they're talking about some other people (americani = masc. pl. ; americane = fem. pl.).
It particularly tripped me up with the sentence, "Sono un cittadino americano.", but looking at it now I see what you mean. If it were the third person plural it would have been, "Sono cittadini americani."