Teacher:In this task, you will be shown a correct English sentence. You need to generate an incorrect form of the input sentence.
Teacher: Now, understand the problem? Solve this instance: Many studies over the last 5 0 years have shown that people who have fluoride in their drinking water have considerably fewer cavities than people who are not drinking water with fluoride . 
Student:
Many studies over the last 5 0 years have shown that people who have fluoride in their drinking water are considerably have less cavities than people who have not drinking nonfluoridated water . 