Regular Verbs

They are verbs which end in -ed. 

For example:                              

work - worked

play - played

you can see a list of the most common regular verbs, in this link:

 http://www.curso-ingles.com/verbos-en-ingles/regular.php

We have some rules to form the past tense of a regular verb

verbs ending in - y, drop -y and add -ied. For example:

study - studied

try -tried

cry - cried

www.saberingles.com.ar/lists/verbs.html

Other rule is for verbs ending in -e, we only have to add -d. For example:

dance - danced

love - loved

hate - hated

Verbs ending in a consonant, preceded by a vowel and this vowel is preceded by a consonant, we have to double the last consonant and add -ed. For example:

stop - stopped

drop - dropped

plan - planned