Can I stump you??

Last week I wanted my students to practice identifying and writing complete sentences.  Modeling first, I wrote two complete sentences and one fragment. 

Example:

1. Today I went to the movies.
2. I saw.
3. I bought popcorn at the movies.

The class was to determine which sentence was a fragment, find the fiction.  Individually the students chose their answers on a sticky note, and then together the team came together with a consensus. They found the fiction, the one that was not a complete sentence.  After students understood what I was looking for, what they were to accomplish, they set off to make their own.