John was clever, wasn't he? -Yes, he was/No,he wasn't
He is stupid, isn't he? -Yes, he is/No,he isn't
This exercise was hard, wasn't it? -Yes, it was/No, he wasn't
This film is interesting, isn't it? -Yes, it is/No,it isn't
This music is too loud, isn't it? -Yes, it is/No, it isn't