Read the extract given below and answer the questions that follow :
Day-by-day the nightingale
Grew more sorrowful and pale.
Night on night her tired song
Zipped and trilled and bounced along.
(a) Why did the nightingale grow sorrowful and pale ?
(b) What did she perform at night ?
(c) What is the poetic device used in the phrase'tired song' ?
(d) Give the rhyme scheme of these lines.
