Here are the sentences transformed into questions:
1. Sam is a pilot. - Is Sam a pilot?
2. We are from London. - Are we from London?
3. They are cute. - Are they cute?
4. It is a blue bike. - Is it a blue bike?
5. She is cold. - Is she cold?
Explanation:
* To create a question from a statement with 'to be' verb (is, are) we usually switch the position of the verb and the subject. For instance, 'Sam is a pilot' becomes 'Is Sam a pilot?'