This powerpoint teaches students about how words were formed. This is a great vocabulary strategy especially for ESL students as many words share origins. Not only does this powerpoint teach students what prefixes, roots and suffixes are, it also teaches them the value of knowing them and how to form educated guesses on the definitions of words using prefixes, roots and suffixes. The powerpoint comes complete with notes on each slide of how to question students and activities for them to do. There is a free worksheet that goes along with the powerpoint for students to complete as you go through the powerpoint.