When using the dative of a noun in combination with a form of the verb esse to indicate possession, should the verb be in the same number as the subject or as the predicate noun(s) when there is a disagreement between the two?
For example, which are correct?
Matching the subject numerically
Puellis sunt rosa. (The girls have a rose.)
Discipulo est multa pocula. (The pupil has many cups.)
Matching the predicate numerically
Puellae sunt rosae. (The girl has roses.)
Discipulis est poculum parvum. (The pupils have a small cup.)