ARE by Maurice Sendak are perfect now. Seek out books with imaginative use of language. Children love silliness, and they love to learn new words. Be sure to include a lot of stories with well developed characters and strong plots. Continue with books that are cumulative and repetitious.
Repetition helps the child learn and make connections.
Include simple nonfiction books too, such as ones about animals or machines. Picture book plots can be longer and more complicated. Read a chapter at a time until the book is done. Introduce wordless books, so children can tell the story themselves. F. Reading to readers.