Помогите passive vouse

I had fixed my bike by the evening
Dont woorry , somebody wiil find the lost dog
Andyoffered me a sandwich
His parents will encourage him to look for a job
Have you switched off the TV set?

I had fixed my bike by the evening - My bike had been fixed by me by the evening.

Don't worry , somebody will find the lost dog . - don't worry, the lost dog will be found by somebody.

Andy offered me a sandwich . - A sandwich was offered me by Andy.

His parents will encourage him to look for a job. -He was  encouraged to look for a job by his parents.

Have you switched off the TV set? - Have the TV set been switched off?