Patience.....
When working with younger children, for example the two six-year-olds that I tutor, I like to give them a "brain break." After working on their sight words and phonics, they read a "Bob Book." Then I use specially lined paper for younger writers with a blank space at the top for them to draw a picture. I encourage them to draw a picture that relates to the story they just read. After they draw the picture, I have them write a sentence about their picture. I like to give them about five minutes. I give them a one-minute warning. Then I say "time's up, you can finish your picture later." But sometimes the child will say "just one more thing" and that turns into "another thing." I show a little patience, but there has to be a stopping point to move on to the learning game/activity. This is when I simply move the paper out of reach and remind them they can finish it later, or tell them that it's time to put away the colored pencils