Past tenses are very visual. That is why I created the following video to explain the grammar. https://youtu.be/PzfGTwEg8iQ

I hope it will help you explain and practise the grammar. 

Hello Zdenda!

Your work is great, thank you! I also visited your website and found loads of great free materials there. On the other hand, I can�t help wondering why you keep the things that don�t work anymore. E.g., I went through the page about Irregular verbs and it was a bit confusing to find out that half of the activities on the page were "out of order". I understand that�s not your fault - just some programmes have stopped working and it must be even more disappointing for you, as creating those games must have taken lots of time.