This document discusses the passive voice in English. It explains that the passive voice is used when the subject performing the action is unknown or unimportant. It also notes that "by" can be used to specify the doer of the action. The document then provides examples of forming the passive voice in the present simple and past simple, using the verbs "to be" plus the past participle of the main verb. Specifically, it shows forming the passive voice with "is/are" for present simple and "was/were" for past simple.

2. Uses
• Cuando no sabemos o no nos importa quién
realiza la acción. ( el sujeto) .
e.g. My bike was stolen. (no sabemos quién
robó la bici).

3. Uses
• Si sabemos o queremos concretar quién
realiza la acción, podemos añadir “by” +
sustantivo.
e.g. My bike was stolen by a thief.

4. Forms
1. Passive Voice – present simple
TO BE (present simple) + past participle.
…is / are + past participle...
e.g. : This cake is made by my mother .

5. Forms
Passive Voice – past simple
TO BE (past simple) + past participle.
…was/ were + past participle...
e.g. : This cake was made by my mother
yesterday.

6. Forms
Passive Voice – past simple
TO BE (past simple) + past participle.
…was/ were + past participle...
e.g. : This cake was made by my mother
yesterday.