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A student of mine had to correct this sentence:-

"Our old car,that we want to sell,has got a puncture."

I can´t see the fault.

Also she had to change this from passive to active:-

"They were given a prize for their hard work."

Starting with the words"A prize..."

For the life of me I couldn´t do it.
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Hi,

In the future, please use two threads to ask two unrelated questions.
AnonymousA student of mine had to correct this sentence:-"Our old car,that we want to sell,has got a puncture."
I can´t see the fault.

By setting it off with commas, you indicate that "that we want to sell" is not important to identifying which car you mean.

If you need to say "that we want to sell" to identify the car, then don't use commas. The car that we want to sell has a puncture. If the information is not important, but is just extra information, change "that" to "which." Our old car, which we want to sell, has a puncture. (As an American, I would just say it has a puncture, not it has got a puncture.)

AnonymousAlso she had to change this from passive to active:-"They were given a prize for their hard work."Starting with the words"A prize..."For the life of me I couldn´t do it.
This is an impossible task unless you know who gave them the prize. A prize was given... is also in the passive. The teacher gave them a prize for their hard work is active, but you need to make up who gave the prize, and ignore the prompt.

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"Our old car,that we want to sell,has got a puncture. I can´t see the fault.-- 'That' introduces restrictive clauses only. Correct: Our old car, which we want to sell, has got a puncture.

Also she had to change this from passive to active:- "They were given a prize for their hard work." Starting with the words"A prize..."For the life of me I couldn´t do it.-- I don't blame you; it cannot be done, since 'prize' is inevitably what was given. You can change it to a different passive: 'A prize was given them for their hard work'.
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Oh. Hi, GG.
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