HI Piedad, how are you?What I always do when I teach 3 year-olds is to mainly enphasize in the vocabulary I want them to learn.
For example, today, I told them the story of a Little Appleseed which wanted to become a Big Appletree.
While telling the story I repeated several times the most important words of it and then ask the children to repeat retelling me the story.
Today, they drew what they liked most about the story, so I asked them which part it was and why, so they repeated again. Of course they help each other when they don�t remember words, etc.
A song is always helpful, or a video... it depends on the story and the time you have.
I hope this is useful for you.
Kisses.
Paola