31.Once i saw a little bird Once i saw a little bird once I saw A little bird Once i saw a little bird; 窗外的小鸟(Once i saw a little bird) Once i saw a little bird(窗外的小鸟) There was a little bird 我是一只小小鸟 (I am a little bird) Once i saw a little bird(我曾经见过一只小鸟) 我是一只小小鸟(I am a little bird)