How do you write like Dr Seuss?

There is no way to be like Dr. Seuss because he is such a unique person. If Dr. Seuss was alive, he would want you to create YOUR OWN style of writing just like he did.

Dr. Seuss wrote poems for children. The way to write like that is to pick something you're interested in sharing with children, then figure out a way to write that in a rhyme instead of prose. Use simple language so they can read it themselves. Many of his stories were humorous, so it's a good idea to make yours funny as well.