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The passive voice
Correct these sentences: *My camera made in japan. *you must do what you told to do.
My camera was made in Japan.
You must do what you are told to do. OR You must do what you were told to do. (The context will determine the verb tense.)
The passive voice needs a form of the verb BE plus the past participle of the main verb. We hope this helps you!
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Why did you write "Our lungs fill with air" while I think it should be "Our lungs are filled with air" as it is a passive voice
Can you tell me what page you’re referring to? I can’t find the context.

“Our lungs fill with air” and “Our lungs are filled with air” are both grammatically correct. The lungs, like other body organs, can be agents; that is, they can do actions. So the lungs fill with air, the stomach digests food (we don’t have to say “food is digested in the stomach”), and the brain stores memories.

We can use either an active or a passive verb with lungs. If you can give me the page and exercise number, I can give you a better answer why the active verb is used.
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Please, which one is correct? If water boils , it evaporates. If water is boiled, it evaporates. Accept my apology for repeating the same question but in another way.
Glad to help you.
Both of these are grammatically correct, but the meaning is a little different. In the first, water is the agent (the one doing the action). This would usually be used for scientific facts such as "Water boils at 100 degrees Celsius."
In the second, there is an agent doing something to make the water boil. The action is more important than the agent, so the passive voice is used.
Your previous question was about "If you boil water..." which is a less formal way of wpeaking about someone boiling water.
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People said that Sally stole the mobile phone.(passive) Sally is said to steal / have stolen the mobile phone. Are they both correct?
No, they're not the same. The first sentence is in the past, so the passiv voice must also be in the past.
"Sally is said to have stolen the mobile phone" is correct because it is in the past.
"Sally is said to steal mobile phones" (note the plural) would mean that people think Sally steals mobile phones.
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What is the difference between (be) covered in & (be) covered with?
The Longman Dictionary of Contemporary English provides an answer.

When cover means “hide or protect,” use with:
She covered the child with a blanket.
He covered his face with his hands.
The dictionary also gives an example with the preposition by: She wore a ... dress partly covered by a thin shawl.

When cover means “form a layer on a surface,” use either with or in:

The eruption of the volcano covered the town with/in fine ash.
So the preposition to use with the passive (as in your question) depends on the meaning of the word cover in the sentence.
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I’d like you to take me to the cinema. (be)
Where is this sentence from? I assume you mean to make this passive: I’d like to be taken to the cinema by you.

But I don’t think anyone would actually say such a sentence. There’s no reason for it to be passive — other than as a grammar exercise.
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I don't mind attending the meeting. Rewrite using "attended". I think the answer will be "I don't mind the meeting being attended."
I don't mind the meeting being attended is grammatical but it is not the same meaning. The original sentence means “I don’t mind that I attend the meeting.” The rewrite that you suggest means “I don’t mind that someone (unidentified) attends the meeting.” You would not use the passive construction to speak about yourself attending the meeting. The passive is used when you don’t know who is doing something.
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This sentence was placed in the 3rd year secondary examination 18/6/2009: Who are you going to invite your birthday party? (be invited)
I assume that you have mistyped this. The original sentence should be Who are you going to invite to your birthday party?

The passive would then be Who is going to be invited to your birthday party?

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Find the mistake. It is exciting to see a heart transplant operation doing.
You need the passive for the verb doing. It is exciting to see a heart transplant operation being done.
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In Sec 2 SB, page 107, Ex 1: "He went back to Harvard to be trained as a doctor." Do you think the active form should be "He went back to Harvard to train him as a doctor" rather than "He went back to Harvard where he trained as a doctor" as in TG page 295? Because I think "He went back to Harvard where he trained as a doctor" is active. "He went back to Harvard where he was trained as a doctor" is passive.
The TG is correct: "where he trained as a doctor."
Train is an unusual verb because it can mean both to teach and to learn. He trained as a doctor (active) means he learned, that is, others trained him. He was trained as a doctor (passive) means that others taught him.
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"Large international corporations, like Japanese car companies, can set up in almost any location." Sec 2 SB page 43. Could it be "Large international corporations, like Japanese car companies, can be set up in almost any location"?
Yes and no. Set up can be transitive or intransitive. So the verb could be made passive (can be set up) but why would you want to here? The rest of the sentence — [can] employ local workers … and trade — would be very awkward. Large international corporations can set up means that they can start operating.
There is no reason to make the sentence you ask about passive. We use the passive when we want to emphasize the action rather than the agent, or when we don’t know the agent. In the sentence you ask about, there is a clear subject that is important to mention.
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He ... alone now as he wants to sleep. (must leave - must be left)
The answer must be passive here.
He must be left alone now as he wants to sleep.
If you want an active verb, you have to supply a subject for the verb.
You must leave him alone now as he wants to sleep.
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