Sometimes a paid website has free stuff!

I was looking for a good warm up technique for the past tense, and using question formation with Did.
The google search took me directly to a free handout on a paid site,

http://www.teach-this.com/Past_Simple/Speech%20Bubbles.pdf

I adapted it and used it for my demo, and for my lesson plan.  

And here's how I used it in the demo: 

 http://www.youtube.com/watch?v=OpPB1AM6KAM&feature=youtu.be