Declarative questions: That’s the boss?

In spoken questions, we do not always put an auxiliary verb before the subject.

• You’re working late tonight?

These ‘declarative questions’ are often used when the speaker thinks he/she knows or has understood something, but wants to make sure or express surprise. A rising intonation is common.

• This is your car? (= I suppose this is your car, isn’t it?)
• That’s the boss? I thought he was the cleaner.
• ‘We’re going to Hull for the weekend.’ ‘You’re going to Hull?’

This word order is not normally possible after a question word.

• Where are you going? (not Where you are going?)