Give the person, number and tense of poniti sumus and write it like this: 1st, plural (or singular), perfect

If this is Latin, 
Remember that: 
Singular: sum, es, est, (1st, 2nd, and 3rd person singular)
Plural: sumus, estis, sunt (1st, 2nd, and 3rd person plural)

So, sumus is 1st person plural.

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.