​​​Answers:-
1.For half an hour the AC was making a strange sound.
2.The company was making an over bridge since 2007.
3.For many centuries, Indians were practising Sati practice.
4.Since last week, the newspaper was publishing the news.
5.Oil prices, for the last week, were going up.

please check this carefully.
​​​Answers:- 1.For half an hour the AC was making a strange sound. 2.The company was making an over bridge since 2007. 3.For many centuries, Indians were practising Sati practice. 4.Since last week, the newspaper was publishing the news. 5.Oil prices, for the last week, were going up. please check this carefully. txcecise 6 Renrite the following sentences using past perfect continuous tense : I. ne AC was Inaking a strange sound. (for half an hour) The company was making an overbridge. (since 2007) Indians were practising Sati practice. (for many centunes) newspaper was publishing the news. (since lust Monday) Oil prices were going up. (fot the last week)

  1. The AC had been making a strange noise for half an hour.
  2. The company had been making an over bridge since 2007.
  3. Indian had been practising Sati practise for many centuries.
  4. The newspaper had been publishing the news since last Monday.
  5. Oil price had been going up for the last week.
Past perfect continuous tense is formed by had + been + verb (in -ing form)

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ok
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1 IS CORRECT
2 IS CORRECT                                                                                                                                                                 3 IS CORRECT                                                                                                                                                                 4 SHOULD  BE  =  THE NEWS PAPER IS PUBLISHING THE NEWS SINCE LAST WEEK                                   5 SHOULD BE   =   OIL PRICES WERE GOING UP FOR THE LAST WEEK.                                          I THINK SO
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 ​​OK IWILL CHECK
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dear friend nandini is correct I guess
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