Jean-Francois, the only "trick" to reported speech is that sometimes the tense shifts back. It doesn't have to if the essential truth of the issue is still true, but it's never wrong to shift it back either. You can use the "that" - you are inconsistent in using it.
Quote 1: "The oil price has been pulling back because the disruption in the oil pipeline supply in Iraq has been resolved," announced Victor Shum.Reported Speech 1: Victor Shum announced the oil prices had been pulling back because the disruption in the oil pipeline supply in Iraq had been resolved. You made price plural. You can keep present or use past.
Quote 2: An official from Iraq's South Oil Co. said that "everything returned to normal as of 10 p.m. Thursday"Reported Speech 2: An official from Iraq’s South Oil Co. said everything returned to normal as of 10 p.m. Thursday. Use "had returned" here
Quote 3: "Canada is becoming a de-industrialized country," Mr. Velan saidReported Speech 3 : Mr Velan said that Canada is becoming a de-industrialized country. Okay. Also okay to use "was becoming"
Quote 4: "No matter what else you say about Mr. Flaherty, he's not giving away the store. He's been very prudent," said William Anderson.Reported Speech 4: William Anderson said no matter what else you said about Mr. Flaherty, he does not give away the store. He has been very prudent. You switched back in tense with say to said, but kept "does" in the present. I'd keep them both present.
Quote 5: "If you built Rolls-Royces in China, you'd never get another sale. The product has to be fantastic," stated Brathwaite.Reported Speech 5 : Mr. Brathwaite stated that if you built Rolls-Royces in China, you would never get another sale. The product has to be fantastic. Okay. The original quote looks like a mixed conditional to me, making tense shifting tricky.
Quote 6: Mr. MacDonald said. "It's just an issue of what Canadian companies will be affected by reductions in demand in the U.S."Reported Speech 6 : Mr. MacDonald said it’s just an issue of what Canadian companies are being affected by reduction in demand in the U.S. No, the original uses "will be" - you can't shift to "are."
Quote 7: ‘’Borrowers with less than stellar credit scores or those trying to finance expensive houses are still struggling to get mortgages,’’ Mr. Gumbel added.Reported Speech 7: Mr Gumbel added that burrowers with less than stellar credit score or those trying to finance expensive will still be struggling to get mortgages. No, you moved from "are" to "will."
Quote 8: “A year ago, we were told the problems were in subprime, ” said David RosenbergReported Speech 8: David Rosenberg said that a year ago, they were told the problems would be in subprime. No, were doesn't move to would be. Just leave it as were.
Quote 9: "Production capabilities are running behind demand," says Joel Plasco, CEO of Collins StewartReported Speech 9: Ceo of Collins Stewart, Joel Plasco said that production capabilities were running behind demand. Okay
Quote 10: "Many of our customers are making money from the price of oil," Cannatelli saysReported Speech 10: Cannatelli said that many of his customers were making money from the prices of oil. Okay
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