Resposta:
a) I was drinking coffee yesterday night. = Eu estava bebendo café ontem a noite.
b) You were using the computer last weekend. = Você estava usando o computador final de semana passado.
c) They were making cupcakes for the breakfast. = Eles estavam fazendo cupcakes pro café da manhã.
d) The dog was playing with the ball. = O cachorro estava brincando com a bola.
e) She was singing very well. = Ela estava cantando muito bem.
f) We were waiting for you. = Nós estávamos esperando por você.
g) I was washing the dishes to clean the kitchen. = Eu estava lavando a louça para limpar a cozinha.
h) Richard was reading a book in English. = Richard estava lendo um livro em Inglês.
i) The boys were flying a kite. = Os garotos estavam soltando uma pipa.
j) Maria was cooking the dinner. = Marias estava cozinhando o jantar.
k) He was talking on the phone. = Ele estava falando no telefone.
l) My sister was going to school when it started to rain. = Minha irmã estava indo pra escola, quando começou a chover.
Boa sorte com as próximas atividades! Espero ter ajudado!
