How would you express in latin it is -est
-erit
-erat
-eritis
how would you express in latin i was
-eram
-eramus
-sumus
-erimus

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.