We do say "Whose are these cups?" as well as "Whose cups are these?" in English
"Who do these cups belong to?" is wrong. Thanks for correcting my English, Duolingo. :-/
'Whom cups are these?' isn't considered correct.. I'm a native Dutch speaker, so please correct me. :)
"Whom" is the form of the pronoun "who" used with prepositions (or archaicly as the object of the verb). E.g. "To whom am I speaking". "Whose" is the form to show possession. E.g "Whose cups are these".
It actually is, you can use one of the following sentences : Whose are these/those cups? or whose cups are these/those?
Is 'mug' an acceptable translation for 'tasse'? I know in Spanish 'mug' is 'taza', so I thought it might be the same in French...
I have always understood accents are omitted from upper case/capital letters, but I have just been warned to watch my accents when I did this...