Question

(Escolha a forma correta do verbo na Voz passiva.)
a) All the trouble … by your mother. (has caused / was caused)
b) That picture ... by my grandmother. (painted / was painted)
c) I ... by his attitude. (shocked / have shocked / was shocked)
d) The fruint... by the children. ( has eaten / was eaten)

Answer 1

a) was caused
b) was painted 
c) was shocked
d) was eaten

Answer 2

a) was caused (Se a gente traduzir, has caused fica igual a "causou", e was caused fica igual a "foi causado" então "o problema foi causado pela sua mãe" é o certo da voz passiva. Mas tivéssemos escrito a frase na voz ATIVA, "sua mãe causou o problema", então usaríamos o "has caused", ficaria "your mother has caused the problem") b) was painted (a mesma coisa. "Painted" = pintou. "Was painted" = foi pintado. A voz passiva é quem recebe a ação, então o certo é "foi pintado", pois "pintou" significa que a pessoa pintou, ou seja, ela praticou a ação (voz ativa)) c) was chocked d) was eaten. (Só poderíamos usar o had se usássemos "has been eaten", porque has been eaten = foi comida. "has eaten" = comeu. Pra resumir, na voz passiva tem sempre que ter o verbo to be antes do verbo principal. Was/were Has been/have been Had been O "has" sem o "been" sempre será voz ativa!