Final answer:
To make the sentences negative, use 'is not' and 'are not'. To make them interrogative, invert the subject and verb and add a question mark.
Step-by-step explanation:
To pass the sentences into their negative forms, you would use the negative forms of the verbs 'is' and 'are'.
- Jack is not Portuguese.
- Ann is not French.
To form the interrogative forms, you would invert the subject and verb and add a question mark at the end of the sentence.
- Is Jack Portuguese?
- Is Ann French?