Passive Voice: Present Simple
English has two voices: active and passive. The active voice is used when the subject of the sentence does the action. In the example, A is the subject and B is the object.
The passive voice is used when we focus on the object of the sentence. In the example, B becomes the subject.
When it is important to know who does the action, we use by. The noun that follows by is called the “agent.” My mom was the subject in the active sentence, but it becomes the agent in the passive sentence.
Sometimes, when the agent is unknown, or unimportant to the meaning of the sentence, we do not use by.
For example: This sweater is made in China.
We form the passive with be + past participle (3rd form of the verb).
In the present simple, the passive is: am / is / are + past participle (3rd form of the verb).