Dou a declaração anual a fim de que ele verifique tudo.

Dou is the 1st person singular present indicative of dar (to give).

So dou = I give, I am giving, or sometimes I do give, depending on context.

Examples:

• Dou a declaração anual... = I give / I am giving the annual statement...
• Eu dou o livro a ela. = I give her the book.

It is worth noting that dar is irregular, so dou does not follow the most basic pattern you might expect.

Portuguese often omits subject pronouns when the verb form already makes the subject clear.

Since dou clearly means I give, eu is unnecessary unless you want emphasis or contrast.

So both are possible:

• Dou a declaração anual...
• Eu dou a declaração anual...

The second version sounds more emphatic, like I give the annual statement.

Literally, a declaração anual means the annual declaration.

Depending on context, it could refer to things like:

• an annual statement
• an annual report
• a yearly declaration
• sometimes even a tax-related declaration, if the context is financial or legal

The exact English translation depends on the situation, but grammatically it is simply:

• a = the
• declaração = declaration / statement
• anual = annual

The a here is the definite article the, agreeing with the feminine noun declaração.

• declaração is feminine singular
• so the article is a

This is very normal in Portuguese. Portuguese uses definite articles more often than English does.

So:

• a declaração anual = the annual declaration

A fim de que is a formal expression meaning so that or in order that.

It introduces a purpose clause: the reason or goal behind the action in the main clause.

So:

• Dou a declaração anual a fim de que ele verifique tudo. means:
• I give the annual statement so that he can check everything.

This expression is more formal than some alternatives.

It is understood and correct, but it sounds formal or written.

In everyday Brazilian Portuguese, people are often more likely to say:

• para que ele verifique tudo
• or sometimes just para ele verificar tudo if the structure allows it

So in casual speech, para que is usually more common than a fim de que.

Because a fim de que requires the subjunctive.

Here, verifique is the present subjunctive form of verificar.

This happens because the clause expresses:

• purpose
• intention
• desired result

After expressions like a fim de que and para que, Portuguese normally uses the subjunctive.

Compare:

• Ele verifica tudo. = He checks everything.
  
  • indicative: a plain statement
• ...a fim de que ele verifique tudo. = ...so that he checks / can check everything.
  
  • subjunctive: purpose/intention

For the verb verificar, the present subjunctive forms are:

• que eu verifique
• que você/ele/ela verifique
• que nós verifiquemos
• que vocês/eles/elas verifiquem

So in the sentence:

• a fim de que ele verifique tudo

the form verifique matches ele in the present subjunctive.

Yes. That is probably the most natural alternative in many situations.

• Dou a declaração anual para que ele verifique tudo.

This means essentially the same thing:

• I give the annual statement so that he can check everything.

The main difference is style:

• a fim de que = more formal
• para que = more common and neutral

Not in this sentence if you want to keep the meaning that he is the one checking everything.

Why? Because:

• a fim de verificar tudo uses the infinitive
• the infinitive version normally works best when the subject is the same as the subject of the main verb

For example:

• Dou a declaração anual a fim de verificar tudo. This would sound like I give the annual statement in order to check everything, where I am the one checking.

But your original sentence has a different subject in the second clause:

• I give ... so that he checks ...

That is why a fim de que ele verifique tudo is used.

Tudo means everything or all of it.

In this sentence:

• ele verifique tudo = he checks everything

Tudo is a pronoun. It stands alone.

Todo, on the other hand, usually works as an adjective or determiner and normally comes before a noun:

• todo o documento = the whole document
• toda a declaração = the entire declaration

So:

• verificar tudo = to check everything
• verificar todo o documento = to check the whole document

Because verificar is normally a direct transitive verb. It takes a direct object without a preposition.

So:

• verificar tudo = to check everything
• verificar o documento = to check the document

No de, em, or other preposition is needed here.

It can mean either, depending on context.

The Portuguese present tense is flexible, just like in many cases in English.

It can express:

1. a general/habitual action

   • Dou a declaração anual todo ano...
   • I give the annual statement every year...

2. an action happening now or around now

   • Dou a declaração anual agora...
   • I am giving the annual statement now...

Without more context, the sentence by itself allows both readings.

Yes, to some extent.

The original order is perfectly natural:

• Dou a declaração anual a fim de que ele verifique tudo.

You could also say:

• Eu dou a declaração anual a fim de que ele verifique tudo.

Adding eu gives emphasis or clarity, but it is not required.

The purpose clause a fim de que ele verifique tudo is most naturally kept after the main clause.

Yes, it is grammatical and natural, especially in a formal, administrative, or written context.

However, in everyday spoken Brazilian Portuguese, many speakers would more likely say:

• Dou a declaração anual para que ele verifique tudo.

That version is usually less formal and more conversational, while keeping the same basic meaning.

It has two parts:

1. Main clause

   • Dou a declaração anual
   • I give the annual statement

2. Purpose clause

   • a fim de que ele verifique tudo
   • so that he can check everything

So the overall pattern is:

main action + expression of purpose + subjunctive clause

This is a very useful pattern in Portuguese:

• Faço isso para que você entenda.

• I do this so that you understand.

• Envio o arquivo a fim de que eles analisem os dados.
• I send the file so that they analyze the data.