Keith Baker's Just How Long Can a Long String Be? is a great vehicle to teach prediction with kindergarten or 1st grade students. The story begins with an ant asking a bird the title question. The bird replies "... it all depends on what it will do from end to end." What follows is a string (pun intended) of uses for string. Ant discovers that string can be used to hold a balloon, hang a picture, and much more. Baker's soft pastel illustrations make you long for spring. You can make a game of finding the ant in each picture.
As a front-loading activity, it would be fun to give students a piece of string and ask them how they could use the string. You could also easily teach problem/solution with this book. An interesting companion book would be Steve Jenkins' What Do You Do With a Tail Like This?.