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So, now we're going to look at changing an active sentence to a passive one.

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Remember, in an active sentence, we begin with the subject, the person or the thing that is doing the action.

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And in the passive, we begin the sentences with the object.

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So, let's look at the first sentence.

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I tidy my bedroom.

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This is in present simple.

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My bedroom is the object, so as it is singular, we use the verb to be, is.

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And then I needs to change to the object pronoun, me.

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So the passive sentence is, my bedroom is tidied by me.

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In the second one, he tidied his bedroom is in the past.

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So we use was and change the subject he to the object pronoun him.

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Mary doesn't tidy her bedroom is in the negative in present simple.

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So we use isn't and then change Mary to her in the passive.

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Who tidied their bedrooms?

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This is a question in the past.

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so we use were

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because their bedrooms is plural

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and we end the sentence with by

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because we want to know who did the action

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now in the last one

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when did you tidy your bedroom?

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this is another question

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it's in the past

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so we need to use was

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because the bedroom is singular

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Bye-bye.