Primary Grammar 3. They is not/ are not butterflies. They are ants. 4. It is not/ am not a house. It is a school. 5. We is not/ are not singers. We are cooks. 6. She is not/ are not old. She is young. 7. The red sweater are not/ is not expensive. It is cheap. 8. My bicycle am not/ is not old. It's new. 9. Their grandson is not/ are not short. He is tall. 10. Miss Lam am not/ is not an accountant. She is a teacher. III. Fill in "am not, isn't, aren't". 1. Mr. Jim isn't from England. 2. Sally and Mary 3. Their fingers 4. The rhino 5. Her stepfather_ 6.1 7. This snake 8. Susan and I my sisters. short. strong. a postman. her English teacher. dangerous. beautiful actresses. {IL