Portuguese Yes-or-No Questions

In Portuguese specifically, yes-or-no questions look the same as declarative sentences, that is, the word order is kept unchanged. A few examples: 

Declarative
Tu estás no Porto. 
You are in Porto.

Interrogative
Tu estás no Porto?
Are you in Porto?

As you see, contrary to other languages such as English, the verb follows the subject in both declarative and interrogative sentences.

Because interrogative and declarative sentences look the same, it is important to intonate interrogative sentences properly so that they come across as intended. 

For instance, when asking, Tu estás no Porto?  you want to finish off in a rising tone so that it clearly sounds like a question. Read on.

Related Video Lessons

As is the case for open-ended questions, yes-or-no questions do perfectly well without any auxiliary verb (which is not the case in English):