Frog simply pressurise the nightangle to sing best...but it was not frog's intetion..he want to kill her as because of her he was tolerating all bad thingsĀ 
1 2 1
Frog was jealous of nightingale's singing as each and every creature in the single bog appreciated her voice. Frog just wanted to ruin her voice and thus he pressurized her to sing even in rainy weather which resulted in the ruining of her voice and at last nightingale was dead because it was no more tolerable.
2 4 2