Add the prefix dis-, mis-, pre-, or un- to the underlined base word in each sentence. Write out the complete word. Notice how the meaning of the sentence changes.

1. Denise and Dorothy agreed about which movie to see.

2. Miguel understood the teacher's instructions.

3. Follow the recipe instructions and heat the oven.

4. The hummingbird appeared each afternoon at three o'clock.

5. Ernie was able to cut the wood with the dull saw.

6. Dinosaurs lived in historic times.

7. Mary read the directions and turned left instead of right.

8. Roger was told never to use his father's computer.