 So, to recap the passive voice. We can see in our example sentence a crocodile ate Henry. This is the active voice. It has the order, subject, plus verb, plus object. Crocodile being the subject, the verb in the past tense, ate, and then Henry as the object. This is the active voice. This sentence can also be expressed in the passive voice, as we can see here. Henry was eaten by a crocodile. Now this takes a different structure. Henry, who was the original object of the sentence, is now in the subject position. We've added the verb be here in the past tense to match the original example. And then we've taken the main verb and changed it to the past participle, eaten. We have then introduced the original subject of the sentence with the word by. So our original sentence, a crocodile ate Henry, becomes Henry was eaten by a crocodile. The main problem for students using the passive voice is to put the verb to be into the correct tense. Our example, a crocodile ate Henry is in the past simple tense. The verb be in the passive voice sentence has to match that tense. So in the past simple, the verb be is was or were. Henry was eaten by a crocodile. Likewise, if we use the present simple, a crocodile eats Henry. We have to use the verb be in the present simple. So it becomes Henry is eaten by a crocodile. We can also have a look at a crocodile is eating Henry, which is the present continuous tense. To put this into the passive voice, we then have to say Henry is being eaten by a crocodile. The present perfect tense, a crocodile has eaten Henry. Henry has been eaten by a crocodile and so on. We can see that the sentences pretty much stay the same. The only thing changing here is the verb be changing into the correct form to match the original sentence. The passive voice is particularly used when the doer of an action or the subject of an action is unknown. For example, a man was murdered last night. We don't know who committed the action. The passive is also used when the doer or subject of the action is not important. For example, my house was built 10 years ago. It's not important to the meaning of the sentence who built it. The passive voice is also used to shift the focus from the original subject to the object. If we look back to our original sentence, a crocodile ate Henry. The focus is on the crocodile. It was a crocodile that ate Henry, not a tiger or a lion. When we move this to the passive voice, we've moved the focus away from the crocodile and onto Henry.