Some students struggle when learning irregular verbs. I know it is important to know the vocabulary. But I would suggest to focus on a small set of verbs. These verbs can be related to the main topic of the unit. 
Download this worksheet to focus on these verbs or use the idea to create your own worksheet!

This video is great! It uses a friendly wat to explain past simple. ED is a time traveller who brings verbs to the past. How does he do it?
He just stands next to the verbs and they travel to the past!
It found this video in Youtube but you can also find it in https://www.nessy.com/

This is another video from https://www.nessy.com/
Now ED introduces Irregular Sue! Ed (time traveler), realizes he has no power on the verbs. They can't travel to the past! So it's time to call Irregular Sue. Sue changes the verbs by using her bubble gun. 
You don't need to use all the verbs you see in video, but I like the way irregular verbs are introduced. 

I took this idea from https://www.weareteachers.com/verb-tenses/
I made my own set of cards. You can use them, or check the link above, there are more cards.
You have two piles of cards: present and past. Flip them over. Did you find a match? Slap it!
Great to use in learning centers.

Another way to practise past tense. 
I use this memory game to teach past regular. 
Great for learning centers.

You can download this worksheet that is about past and present. 
Students have to color the correct answer. They should pay attention to the time expressions.

This is a PowerPoint presentation to elicit and introduce the grammar topic "Past Simple" to children or pre teens using clear explanations, arrows and a colour-coding system to facilitate learning #PastSimple #Yazoo4

✨✨🎉Hola, les saluda Miss Cinthia🎉 ✨✨
En esta oportunidad les presento este material que les puede servir para trabajar el tema: ''simple past'' con algunos verbos irregulares, como también puedan responder ayudándose de algunas preguntas.
Espero le sea de mucha utilidad como lo fue para mí al trabajarlo con mis estudiantes.

Materia: Inglés
Tema : Past tenses- Past simple
Este es el primero de 4 actividades acerca del pasado, (pasado simple) viene una breve explicación de qué es y cómo se usa, además de algunos ejemplos, al final viene un juego "El circo" para poder practicar lo aprendido en clase

Materia: Inglés
Tema: Past tenses- Past perfect - pasado perfecto
continuando con el tema de Past tenses, ahora veremos el Pasado perfecto en inglés, en este material podrás encontrar datos acerca del pasado perfecto, estructura, usos y ejemplos, además ala final tendrás acceso a un juego interactivo para poder practicar con los alumnos lo aprendido en clase