Karagdagang Gawain Panuto: Ibigay ang sariling opinyon sa isang usapan. Pakinggang mabuti habang
binabasa ng magulang o kamag-anak. Isulat ang sagot sa iyong sagutang papel
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Permafrost is a thick layer of soil frozen throughout the year. two words to create permafrost would be permanent ice.

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Betray, destroy, and obey do not need to be changed to add the suffix -ed, because the "y" at the end of each word is preceded by a vowel  (so  they would be spelled  "betrayed," "destroyed," and "obeyed").

but hurry is different; it has to  be spelled "hurried" because the "y" at the end of "hurry" is preceded by a consonant.