arbeiten an + dative to work on
erzählen von + dative to talk about
fahren mit + dative to go (by means of)
haben Angst vor + dative to be afraid of
helfen bei + dative to help with
halten von + dative to think of, to value
handeln von + dative to deal with
träumen von + dative to dream of
denken an + accusative to think of
lachen über + accusative to laugh about
lesen über + accusative to read about
nachdenken über + accusative to think about
schreiben an + accusative to write to
schreiben über + accusative to write about
sprechen über + accusative to talk about
warten auf + accusative to wait for
bitten um + accusative to ask for
glauben an + accusative to believe in
sorgen für + accusative to care for