Este enlace que os lleva a un montón de ejercicios sobre el past simple:

http://www.agendaweb.org/verbs/past_simple-exercises.html

Este enlace es curioso porque os explica el past simple mientras practicáis el listening (tiene 2 partes)

http://www.english-test.net/esl/lesson-plans/grammar_simple_past.HTML

Y un video de You Tube (3:49)

https://www.youtube.com/watch?v=xLA58CSIf3M

Un enlace con los verbos irregulares y su pronunciación:

http://verbos-irregulares.blogspot.com.es/2011/05/verbos1.HTML

Al final de esta entrada podéis encontrar un documento con los verbos irregulares para descargar.

¿Cómo se forma?

SPELLING RULES OF THE PAST TENSE

If a regular verb ends with CONSONANT + Y change the Y to I before adding ED forboth the simple past and past participle forms.

carry------carried

copy-----copie

dcry-----cried

marry-----marrie

dreply-----replied

study-----studied-

If a regular verb ends with CONSONANT+VOWEL+Y add ED with no other spellingchanges for both the simple past and past participle forms.

annoy-----annoyed

enjoy-----enjoyed

play-----played

stay-----stayed

obey-----obeyed

If a regular verb ends with E add only D for both the simple past and past participleforms.

advise-----advised

agree-----agreed

If a one-syllable verb ends with CONSONANT+VOWEL+CONSONANT, double thefinal consonant before adding ED to form both the past simple and the past participle.

plan-----planned

rob-----robbed

stop-----stopped

stir-----stirred

zip-----zipped-

If a verb with more than one syllable ends with CONSONANT + VOWEL +CONSONANT, double the final consonant before adding ED (only when the lastsyllable is pronounced more strongly than the others) to form both the past simple and past participle.

prefer-----preferred

regret-----regretted

permit-----permitted

but...

visit-----visited

listen-----listened

develop-----developed

remember-----remembered

If a regular verb ends witht L and the last syllable is not pronounced more stronglythan the others, the final L is often doubled in British English but not in AmericanEnglish to form both the past simple and the past participle.

Cancel-------canceled (Am)----- cancelled

(Br)Travel--------traveled (Am)------- travelled (Br)