Resposta:
a. It wasn't a very hot and sunny afternoon.
b. The grapes weren't looking ripe and ready to burst with juice.
Explicação:
A negativa acompanha sempre o verbo to be no passado + o not was not, were not que na forma contraída fica wasn't ou weren't, no caso da letra B o verbo também precisa sair do passado LOOKED para o Loking no particípio.
