Question

Change the following sentences to the passive voice.
1. You must put out all smoking materials. _____________________________________________________
2. You must fasten the seat belt. _____________________________________________________
3. They will demonstrate safety precautions. _____________________________________________________
4. You should read the safety instructions. ______________________________________________________
5. You can store small packages in the overhead compartment. ______________________________________________________

Answer 1

All smoking materials have to be put by you.

The seat belt have to be fastened by you.

Safety precautions will be demostrated by them.

The safety instructions need to be read by you.

The overhead compartment could stored small packages.
Puedes omitir cada BY y lo siguiente, ya que en la voz pasiva, no interesa tanto el ejecutor de la acción, como en la ultima oración.
espero te sirva...