The sweetest ---- in the world is birds' singing

The sweetest ---- in the world is birds' singing You've got the sweetest ass in the world Love is the sweetest The sweetest world for me is love 的意思 The birds are singing in the tree.对singing提问 (The sun is shining,birds are singing. The birds (are singing) in the tree括号部分提问 The birds are singing in the trees.翻译 Listen!The birds are singing （beautiful）in the woods 英语翻译Today is sunny.Two birds are singing in the tree,There i that is a fierce tiger .改为复数句 these birds are singing in the some birds are singing in the tree.改为一般疑问句