Genitive & Dative with Adjectives, Accusative Subjects

Genitive with Adjectives. The genitive complements adjectives denoting fulness, emptiness, desire, sharing:

avidus laudis – ‘eager for praise’

memor suī – ‘mindful of himself’

perītus legis – ‘skilled in the law’

plēnus spēī – ‘full of hope’

orbus parentum – ‘bereft of parents’

Dative with Adjectives. Adjectives denoting relatioships (near to, friendly to, alien to, hostile to, similar to, suitable for – and their opposites):

inīmica mihi – ‘hateful to me’

locus castrīs idōneus – ‘a place suitable for a camp’

similis deō – ‘like unto a god’

nōbīs ūtile – ‘a thing useful for us’

Accusative as Subject of Infinitives. The accusative regularly expresses the subject of an infinitive when an infinitve phrase is used as the subect of an ‘impersonal’ verb:

tempus est nōs discēdere – ‘It is time for us to depart’

decet nōs hoc facere – ‘It is proper for us to do this’

mē iuvat haec meminisse – ‘It helps me to remember these things’