This is an interactive whiteboard activity for teaching students the difference between letters, words and sentences as well as what makes a word and a sentence. Students are asked to hold up a card that says either letter, word or sentence when they are shown a slide on the board. This is a great and easy way to assess who understands the difference. This activity also gives students an opportunity to spell words using letters and also to make sentences with given words. Students will need flash cards with the words letter, word and sentence in order to display the appropriate word when going through the activity. I put cards that can be printed on the last slide, or you can create your own on index cards. My class (kindergarten) loved this activity!