"Sono un cameriere."
With 'sono' being essere's conjugate for both Io and Loro, is there a way to tell which one it is in this context? Or am I missing something? My answer 'They are a waiter' was marked as incorrect... :(
Whatever makes sense is correct. If "sono" was refering to "loro", you would have to say "they are waiters". In the sentence, "un" is used which only refers to one waiter. My explanation might not be good :)
"They are a waiter" is nonsensical. You might say "They are waiters", which would be "sono camerieri". In some situations, it can be ambiguous whether the "sono" refers to "io" or "loro", but it's usually clear from the context (which Duolingo doesn't usually provide).
I thought that nouns ending in -e changed to -i in the plural regardless of the gender of the noun. In which case you'd have Sono camieri for both They are waiters and They are waitresses.
Is that wrong? Or is it that an exception is made in cases such as these (ie with professions)?
Not generally. "a waiter" = "un cameriere", "a waitress" = "una cameriera". If you don't know the gender, though, the masculine is usually used.
Shouldn't it be 'sono cameriere' instead of 'sono un cameriere'? I thought that articles are not used before professions in Italian.