In English, you can ask simple yes/no questions by either inverting the subject and verb or by using rising intonation:

–We can change money here.
   (simple, declarative statement)

–Can we change money here?
   (question with verb first)

–We can change money here?
   (question with rising intonation)

NOTE: In the case of the simple present tense, it is necessary to use a form of the verb to do as an auxiliary in making a question:

–They like this bank.
–Do they like this bank?

–You have a passport.
–Do you have a passport?

Examples of Asking Questions

• May I see your passport please?
• How would you like your money? In twenties, fifties, or hundred dollar bills?
• May I help you?