It is thanks to his jealousy that the Frog becomes the sole singer at the end of the poem.
He envied the Nightingale's talent and therefore tricked the Nightingale into practicing so much it died. After the Nightingale's death, the Frog became the only (and therefore best) singer. The Frog's success was only possible due to his jealousy. If he had not been jealous of the Nightingale, the Frog would not have become the singer he became.
I guess i have to fill in space-His sister-Apex
Gray billowing clouds, the howling wind and thunder in our ears, above our heads, we donned our ponchos, ready.
Hope this helps. Please do mark brainliest! (:
Issues that you should look for to correct the proofreading stage:
Grammar
Spelling
Punctuation