пожалуйста помогите разобраться с этим срочно

3 задание:I am a student. He/she is a student. We/you/they are students.I am tired. He/she/it is tired. We/you/they are tired.I am sure. He/she/it is sure. We/you/they are sure.4. a) Is that boy American? This boy isn’t American.b) Are there the topics for your exam? There aren’t the topics for you exam.c) Are those students football fans? Those students aren’t football fans.d) is she interested in science? She isn’t interested in science.