Felipe __________________________ (buy) bread but Felipe didn't know we needed it. (past possibility
I could have bought bread but I didn't know we needed it. (past possibility)
Francesca ___________________________________ (invite) so many people to our party! i''m worried that she won't have enough room for everyone. ( / regret)
Francesca shouldn't have invited so many people to our party! I'm worried that we won't have enough room for everyone. (past negative advice / regret)