Помогите, никак не разберусь переведите предложения и определите залог и время

Помогите, никак не разберусь

переведите предложения и обусловьте залог и время сказуемого.

a) Pupils are taught at school by the teachers.

b) She sent a letter yesterday.

c) English is spoken in many countries.

d) This problem be discussed next week.

e) The conference was held last week .