Fill in the gaps with am, is, are, isn't, aren't 1. Liz ______ in Year 7? - No, she ______. 2. My sister... fifteen. She ______ sixteen. 3. Their names ______ John and Paul. They ______ at primary school. 4. ______ you good at Maths? - Yes, I ______. 5. Cathy and I ______ best friends, but we ______ in the same class.