the dogs bark .
the dog barks .
*the dog bark .
*the dogs barks .
*dog bark .
dogs bark .
*the dogs bark the cats .
John thought that the book was interesting .
*John thought the book .
*Mary put the book .
Mary put the book on the shelf .
did Mary put the book on the shelf ?
*put Mary the book on the shelf ?
what did Mary put on the shelf ?
*what did Mary put ?
what does John know ?
what does Mary think John knows ?
the farmer loaded the cart with sand .
the farmer loaded sand into the cart .
*the farmer filled sand into the cart .
the farmer filled the cart with sand .
Mary saw herself .
*Mary saw himself .
John saw himself .
John reached the summit on Tuesday .
*Mary reached the summit for five minutes .
John walked on Tuesday .
Mary walked for five minutes .