Answer:
The error is in the third sentence. The correct sentence should be: "Regardless of your teaching method, the objective of any conversation class is for the students to practice speaking words."
Explanation:
The word "should" is used to express a recommendation or suggestion. In this case, it is not appropriate to use "should" because the objective of a conversation class is not a recommendation or suggestion. It is a requirement.
`` The word "is" is used to express a fact or reality. In this case, it is appropriate to use "is" because the objective of a conversation class is a fact. It is a requirement that students practice speaking words in a conversation class. ``
