¿Tienes alguna duda sobre el informe?

Because tienes is the tú form of the verb tener in the present tense.

• yo tengo = I have
• tú tienes = you have
• él / ella / usted tiene = he / she / you (formal) have(s)

So ¿Tienes alguna duda sobre el informe? is addressed to one person informally.

If you were speaking formally, you would say:

• ¿Tiene alguna duda sobre el informe?

In Spanish, subject pronouns are often omitted because the verb ending already shows who the subject is.

• tienes already tells you the subject is tú

So:

• ¿Tienes alguna duda sobre el informe?

and

• ¿Tú tienes alguna duda sobre el informe?

both mean the same thing, but the version without tú is more natural in most situations.

You might include tú for emphasis, contrast, or clarity.

Alguna means any or some, depending on context.

In this sentence, ¿Tienes alguna duda...?, it is best understood as any:

• Do you have any doubts/questions about the report?

It comes from alguno / alguna, which changes to match the noun:

• algún problema = any problem
• alguna duda = any doubt / any question

Because duda is feminine singular, you use alguna.

Spanish often uses the singular after alguno / alguna when English might naturally use a plural.

So:

• ¿Tienes alguna duda? = Do you have any questions? / Do you have any doubt?

This is very common and natural in Spanish.

You could also say:

• ¿Tienes algunas dudas?

but that sounds less neutral and can suggest that the person probably does have several doubts.
¿Tienes alguna duda? is the standard, polite way to ask.

Literally, duda means doubt, but in many contexts it is also used the way English uses question.

So ¿Tienes alguna duda? can mean:

• Do you have any doubts?
• Do you have any questions?

In classrooms, meetings, and work settings, this is extremely common. It does not necessarily mean deep uncertainty; it often simply means anything you want clarified.

Sobre here means about or regarding.

• sobre el informe = about the report

This is the most direct and natural choice in this sentence.

You would usually not say ¿Tienes alguna duda del informe? because dudar de means to doubt something, which changes the meaning.

Compare:

• tener dudas sobre algo = to have questions/doubts about something
• dudar de algo = to doubt something

So sobre is correct here.

Informe usually means report.

It is a masculine noun:

• el informe

It often refers to a written document in professional, academic, administrative, or official contexts.

Depending on context, it could be:

• a business report
• a school report
• a medical report
• an official written assessment

El informe means the report, so it refers to a specific report that both speaker and listener know about.

• ¿Tienes alguna duda sobre el informe? = Do you have any questions about the report?

If you said:

• ¿Tienes alguna duda sobre un informe?

that would mean about a report, which sounds less specific and is only used if the report has not been clearly identified.

This version is informal because it uses tienes, the tú form.

In Spain, you would often use:

• ¿Tienes alguna duda sobre el informe? with friends, classmates, coworkers you address as tú, younger people, or in relaxed contexts

For a formal version, use usted:

• ¿Tiene alguna duda sobre el informe?

That is more appropriate in customer service, professional situations, or when speaking respectfully to someone you do not know well.

Yes, you can, and it is grammatically correct.

But there is a small difference in tone:

• ¿Tienes alguna duda sobre el informe? = more neutral, polite, and common
• ¿Tienes dudas sobre el informe? = a bit more direct, and it may sound more like you think the person probably has doubts

Using alguna softens the question slightly and sounds very natural in Spanish.

A Spain pronunciation would be approximately:

• TYEH-nes al-GOO-na DOO-da SO-breh el in-FOR-meh

A bit more closely:

• ¿Tienes → TYEH-nes
• alguna → al-GOO-na
• duda → DOO-da
• sobre → SO-bre
• el informe → el in-FOR-me

In much of Spain:

• tienes has a clear y sound at the start of ie
• duda has a soft d
• r in sobre is a light tap, not a strong English r

Spanish uses an opening and a closing question mark:

• ¿ ... ?

This helps the reader know from the beginning that the sentence is a question.

So:

• ¿Tienes alguna duda sobre el informe?

This is standard punctuation in Spanish and should always be used in writing.

Yes. It is very versatile.

It can be used in:

• a classroom: a teacher asking if students have questions
• an office: a manager or colleague asking about a report
• customer support or administration: asking whether someone needs clarification

Because duda can mean both doubt and question, the sentence works well in many situations where someone is checking for understanding.

Yes, you could say:

• ¿Tienes alguna duda acerca del informe?

This also means Do you have any questions about the report?

Both are correct, but sobre is often simpler and more common in everyday use.

Notice that with acerca de + el informe, you get the contraction:

• acerca del informe

because de + el = del.