Let us take this title for example, " The Cars should Be sold in Three Years". If lowercase or uppercase rules are from the Chicago Manual of Style, the word should is lowercase or uppercase?
I have browsed this website and seen Which words in a title should be capitalized?, but the answers there do not mention modal verbs.
Few British editors would give those rules house room.
– Robbie Goodwin Aug 15 '17 at 16:45