1.The librarian didn't allow Tom to take those books home.
Tom wasn't allowed to take those book home by the librarian.
2.The teachers won't teach knowledge on recycling tomorrow.
knowlegde on recycling won't be taught by the teachers tomorrow.
3.Hoi An attracts a lot of foreign tourists.
A lot of foreign tourists are attracted by Hoi An.
4.Did all studént attend first-aid course last year?
Was first-aid course attended by all students last year?
5.Famers can milk cows twice a dạy
.Cows can be milked by farmer twice a day.