Yes,I am happy/no, I am not happy.
yes,you are a good teacher/no,you are not a good teacher.yes,my father is rich/no,my father is not rich.
yes,we are studying for the test now/no,we are not studying for the test now.
yes,I am interested in science/no, I am not interested in science.
yes,the students are tired today/no, they are not tired today.
yes,the teacher is in the class/no, the teacher is not in the class.
yes,the boys are doing the exercise/no,the boys are not doing the exercise.
yes,you are my friend/no,you are not my friend.
yes,she is/no,she is not.