Connect the story to their lives. Make the links between what they see in books and their own experiences. "Remember when we went to the zoo...." This helps reading comprehension later
Have print all around and point it out. Signs, newspapers, flyers, receipts, shopping lists, alphabet magnets on the fridge = print awareness
Add vocabulary (explain new words) and ideas at every opportunity. "Cow babies are calves and giraffe babies are calves too! Guess what whale babies are called?
Talk to your little ones about rhyme and sounds. "Room sounds like broom, they rhyme". "squelch squerch" sounds like mud stuck to your boots!
Start wondering together and predicting what might happen "I wonder what this book is about?" "I think he's going too..." "Oooh I wonder what's going to happen now?"