( There ( ( were ( ( six ( or ( seven birds ) ) ) ( that ( ( could easily ) ( have ( been ( Best ( of Breed ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD were) (NP (NP (CD six) (CC or) (CD seven) (NNS birds)) (SBAR (WHNP (WDT that)) (S (VP (MD could) (ADVP (RB easily)) (VP (VB have) (VP (VBN been) (NP (NP (JJS Best)) (PP (IN of) (NP (NNP Breed))))))))))) (. .)))
There were six or seven birds that could easily have been Best of Breed.
(ROOT (S (NP (NNP Birds)) (VP (VBP live) (CC and) (VBP breed) (PP (IN on) (NP (NP (CD seven)) (PP (IN of) (NP (DT the) (NN continents)))))) (. .)))
Birds live and breed on seven of the continents.