agree
Verbs end in e: agree + d = agreed
melt
Most verbs: melt + ed = melted
copy
Verbs end in a consonant + y: copy - y + ed = copied
complain
Most verbs: complain + ed = complained
watch
Most verbs: watch + ed = watched
clean
Most verbs: clean + ed = cleaned
clap
Short verbs ending in a vowel letter + a consonant letter: clap + p + ed = clapped
study
Verbs end in a consonant + y: study - y + ied = studied
hop
Short verbs ending in a vowel letter + a consonant letter: hop + p + ed = hopped