Okie dokie, but in the 'flirting' Duolingo exercise there's a 'Hallo Schoner' line which it translated as 'Hello handsome' rather than 'hello handsom-er.' So would it just be the context that differentiates between the meanings?
It is context when spoken, but in writing it's clear. In the "Hello handsome" exercise, "Schöner" (capitalized!) is a noun meaning "handsome one" with correct declension, while in this case "schöner" (lower case) is an adjective.
I typed "Are they more beautiful?" and was marked wrong...
1) How to determine in this case whether sie = she or they?
2) To clarify, "more beautiful" would be an alternative answer for "prettier" i.e. schöner?