a. Choose the right option
1. That .......... a dog
2. Those .......... beautiful flowers right there.
3. This .......... Jack. Jack is at school right now
4. .......... you a student?
5. We .......... going to Canada this winter
6. I .......... a teacher
7. .......... Nick our classmate?
8. .......... you sure that this is the only dress that I have?
9. Tristy .......... a nice person. .......... always help .......... when I needed help.
10. Brad .......... a good person. He .......... a bully
b. Write the negative form of these following sentences