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An alien is reporting back to its home planet about Earth's strange animals. Help the alien fix its grammar! Select ALL the sentences that apply the spelling rules of superlative adjectives correctly.
The correct answers are The cheetah is the fastest land animal on the planet. and The elephant is the biggest land mammal we found.
Short adjectives usually just add "-est" (fastest).
If a short adjective ends in a single vowel followed by a single consonant (like "big"), you must double the final consonant (biggest).
For adjectives ending in "-y" (like "heavy" and "lazy"), change the "y" to an "i" before adding "-est" (heaviest, laziest). "Most laziest" is an incorrect double superlative.