The frog is a great schemer.He is jealous of song of nightingale.So he find faults with her song instructs her to practice hard.He suggested her that she should follow him in singing continously loud.But,when nightingale follows him becomes hoarse in voice.He very cunningly remarks that your song must be your own.Here lies the irony.

Hope this helps.................Happy to help you.
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Thanks a lot.It had helped me a lot.