Question 1

Why is there a de in debe de ser?

Accepted Answer

The phrase deber de plus an infinitive is used to make a deduction or assumption, meaning "must be" (as in "I assume it is"). If you leave out the de and just say debe ser, it traditionally implies an obligation ("it is required to be"). Note that in casual, everyday speech, many native speakers will just use deber for both!

Question 2

Where is the word for "it" in debe de ser?

Accepted Answer

In Spanish, the subject pronoun "it" is almost always left out. The "it" is already built into the third-person singular verb debe.

Question 3

Since the dog is barking right now, why does the sentence use ladra instead of está ladrando?

Accepted Answer

In English, we usually use the present continuous ("is barking") for actions happening at this exact moment. In Spanish, the simple present (ladra) can mean both "barks" and "is barking." While you absolutely could say está ladrando here, using the simple present for right-now actions is completely natural and very common.

Question 4

If the mail carrier were a woman, would I say la cartera?

Accepted Answer

Yes, you would! Just rely on the context of the sentence so people know you mean a mail carrier, because la cartera is also the standard word for "purse" or "wallet" in many Latin American countries.

Debe de ser el cartero porque el perro ladra.

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