Part of comprehending books is being able to summarize what you've just read or seen. Some kids aren't ready to read and summarize a book, but they can summarize movies and TV programs.
After watching a film or program like Curious George or Thomas, work together with your kids to make a five page book about what you've seen. Divide your book into the five traditional story parts (Freytag's Pyramid) to make the act of summarizing more focused:
The Exposition: the introduction to the main character(s) and basic situation
The Inciting Incident: the introduction to the central conflict
The Development: how the characters and conflict develop during the rising action
The Climax: the highest point of suspense or interest
The Resolution: the event that ends the central conflict
Help your kids write labels or very short statements. Just remember to use THEIR words. It is up to them to summarize, not you! If they can't organize the story well, remind them how it developed.
For emerging readers, use short programs with very simple stories.