Here are two sentences:

The researchers found only empty cavities and scar tissue where the tumors had been .

No tumors were detected ; rather , empty cavities and scar tissue were found in their place .

yes

Here are two sentences:

The company has said it plans to restate its earnings for 2000 through 2002 .

The company had announced in January that it would have to restate earnings for 2002 , 2001 and perhaps 2000 .

yes

Here are two sentences:

Freddie Mac shares were down more than 16 per cent at $ 50.18 at midday yesterday .

Freddie Mac shares were off $ 7.87 , or 13.2 percent , at $ 52 in midday trading on the New York Stock Exchange .
yes