Compound Sentences Smart-board lesson and activity- This smart Notebook file is a great introduction or review to compound sentences. This file can be used in second to third grade or higher. The file includes 13 slides and has a complete introduction to compound sentences. There are three activity pages to reinforce and practice compound sentences. I have included: the core content standards implemented, an object, essential questions, answer key to the activity, and a link to an online game that reinforces sentence structure.