Why does this sentence use "invadere" instead of "invaso" ? Hello, I came across this sentence in a book: Jahns avrebbe volute aggiungere qualcosa, ma si senti’ invadere da un’improvvisa tristezza. Translation: Jahns would have liked add something, but felt overwhelmed by a sudden sadness. My question is: Why isn't it "si senti' invaso" (she felt overwhelmed) The infinitive (invadere) does not seem correct here. Can someone please explain? Also, as I was posting this I noticed something else. It says "Jahns avrebbe volutE.." Why is this not volutO? Jahns is one singular female, but the past participle seems to be conjugated as referring to something that is feminine/plural, and anyway the verb is conjugated with avere and there is no object pronoun anywhere so the past participle should not change. It does not seem to be used as an adjective, either. Can someone please explain why this is not volutO and why it is volutE? Thank you very much.

Should this sentence say "aiutato" instead of "aiutati" ? I am reading a book where a man and a woman are talking to another man about his daughter. The daughter once helped with an investigation, so the man says to the father "Una volta ci ha aiutati in un'inchiesta." If aiutare is conjugated with avere, then the ending of past participle should not need to change for any reason, right? Shouldn't this say "Una volta ci ha aiutato in un'inchiesta" ? Is this a typo in the book, or is there something that I am not understanding correctly? Thanks.