给定一组英文句子，将其中的名词提取出来并组成一个新的句子。
句子：
The cat is sleeping on the sofa. The dog is playing with a ball. The bird is singing on a branch.
Nouns extracted from the sentence:

cat, sofa, dog, ball, bird, branch

New sentence:

The cat is sleeping on the sofa. The dog is playing with a ball. The bird is singing on a branch. 

Nouns: cat, sofa, dog, ball, bird, branch.