Lets Us Look Into Simple Past Regular Verb

The past tense of a verb is usually formed by adding "ed" to the end of the verb. If the word ends with an "e," then just add "d".

The past tense of the verb "to listen"

Person		Singular	Plural
first		I listened	we listened
second		you listened	you listened
third		he listened	they listened
third		it listened
third		she listened

Further Examples:

Infinitive		Past form	Sentence form
live		lived	Elizabeth and I lived in France last year.
watch		watched	You and the man watched tennis in 1986.
talk		talked	The people talked last night.
use		used	The team used a bus to travel to the last game.

When the past tense of a verb ends in a "y" preceded by a consonant, then form the simple past verb by dropping the "y" and adding "ied" to the end of the verb.

The past tense of the verb "to study"

Person		Singular	Plural
first		I studied	we studied
second		you studied	you studied
third		he studied	they studied
third		it studied
third		she studied

The past tense of the verb "to play"

Person		Singular	Plural
first		I played	we played
second		you played	you played
third		he played	they played
third		it played
third		she played

For more details:
http://www.tcet.com/eaonline/GrammarCentral/simplepast.html