Complete the sentences with isn't, am not or aren't: a. I ___ French. I'm Italian. b. She ___ sad. She's worried. c. The cat ___ nice. It is bad. d. He ___ a doctor. He is a dentist. e. They ___ siblings. They are cousins. f. We ___ in the kitchen. We are in the bedroom.

Here are the completed sentences: a. I am not French. I'm Italian. b. She isn't sad. She's worried. c. The cat isn't nice. It is bad. d. He isn't a doctor. He is a dentist. e. They aren't siblings. They are cousins. f. We aren't in the kitchen. We are in the bedroom. **Explanation:** * **am not** is used with the pronoun 'I' to form a negative statement. * **isn't** is used as the contraction of is not and is used with singular subjects (She, The cat, He). * **aren't** is used as the contraction of are not and is used with plural subjects (They, We).