When I hover over "le sue" it says both "his and hers". How do I know when it's masculine and when it's feminine?
it's related to the owned object, not the one who owns it. in this case, "bottiglie" is plural feminine, therefore you use "le sue"
Yea, and the only real way of finding out whether the "Sue" means "his" or "her" is by context. Same thing happens with French.
No, when the possessive is in predicate position as here, the article is optional.
A predicate in grammar is "the part of a sentence in which something is asserted or denied of the subject of a sentence" (Collins): it always includes a verb and possibly some objects. In "the bottles are his", "his" refers back to the subject (his bottles) and is "predicative"; in "he eats his", "his" doesn't refer back to "he", but to an omitted object (food?). In the first case in Italian you can omit the article (le bottiglie sono sue), in the second you can't (e.g. lui mangia il suo).
But, if you were being more formal & using 'Lei' - wouldn't it be correct to say "le bottiglie sono le sue" meaning "the botttles are yours" - formal?
In the context of Duolingo, that would be capitalized as "le Sue"; that's the grammarians' recommendation, but in real life capitalizing is perceived as even more formal, and usually avoided.
Would I say: Le bottiglie sono i suoi. Is that correct for: The bottles are his.
No; the adjective suo/sua/suoi/sue means both his and her. The gender and number, like with any adjective, must match the noun it refers to, so "le bottiglie" -> "le sue bottiglie" -> "le bottiglie sono le sue" or "le bottiglie sono sue". That could mean both "the bottles are hers" and "the bottles are his".
Then there's no way in distinguishing whether the bottles are his or hers other than calling the person by name?
Or by assigning the bottles to a pronoun representing a person of a specific gender, for example "le bottiglie sono della donna / di ragazzi".
The pronunciation of the word "lei" sounds like this, but the correct word is "le"
Can someone confirm if i'm right about this? I'm so confused and i feel like i'm not making sense of it.
Does "le sue" ever change in regards to "le bottiglie"? Like in the sentence "Susie, Betty, and Sarah collect trash. The bottles are theirs." Will that still be le sue because THEY are WOMEN, or does it switch to le loro? Or does it do neither, because it refers only to the bottles and not to the people who own them?
you have already answered it. it is "le loro". it is feminine plural because of "bottiglie" , and "loro" is because of "theirs".
Neste caso "sue" está referindo-se à possessão. Acho que deveria ser aceito The bottles are yours.