Resposta:
a) see = saw
b) eat = ate
c) to go = went
d) to speak = spoke
a) He speaked to me in Germany = Ele falou comigo na Alemanha. (o verbo speak aqui está errado, o correto deveria ser "spoke" pois estamos falando de passado.)
b) I studied in the morning = Eu estudei de manhã.