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Please, change this to passive voice...

1. George has ironed his shirts.
2. Don't disturb him, he's serving the dinner.
3.They aren't going to inform you.
4. How many children has he taken for the trip?

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I'm pretty sure it'd be something like:
1. The shirts are being ironed by George.
2. Don't disturb him, the dinner is being served by him.
3. You are not going to be informed by them.
4. How many children will be taken by him on the trip?