I'll just stop here for a moment now and come back later to write some more. As a teacher, I've had the opportunity to learn a lot from children. I'll just give you a few examples:
choose cheese cheese
sing sang song
and one that actually makes some sense (somehow):
forgive forgave forgotten
Exercise on past simple and past progressive:
He cooked dinner when he was cutting his finger.
He drove home when he was crashing into a tree.
I hope it made you smile. :)