Antes de sair, você tem que ver se a gaveta está fechada e se o fogão está limpo.

In Portuguese, antes de + infinitive is the normal pattern for before doing something.

• antes de sair = before leaving
• antes de comer = before eating
• antes de dormir = before sleeping

So the de is required here.

A related pattern is antes que + subjunctive, used when you introduce a full clause:

• Antes que você saia... = Before you leave...

In this sentence, antes de sair is the most natural structure.

Because after the preposition de, Portuguese normally uses the infinitive form of the verb.

So:

• antes de sair
• depois de comer
• sem falar

Also, the subject is understood. The person who must check things is also the person who will leave, so Portuguese does not need to repeat the subject here.

If you want to make the subject explicit, you can say:

• Antes de você sair...

That is also correct.

Você tem que means you have to or you need to.

Literally, ter que is a very common way to express obligation in Brazilian Portuguese.

• Você tem que estudar. = You have to study.
• Eu tenho que ir. = I have to go.

A few close alternatives are:

• você tem de
• você precisa

All are common, though tem que is especially frequent in everyday Brazilian speech.

Not always, but it is very common to include it.

Portuguese often drops subject pronouns when the verb ending already makes the subject clear. However, with você, the verb uses the same form as ele/ela, so the subject is not always obvious from the verb alone.

That means:

• Tem que ver... can work if the context is clear.
• Você tem que ver... is clearer and very natural.

So você is not strictly required, but including it is normal and often helpful.

Yes, literally it is see if, but in this kind of sentence it often means check whether or make sure.

So here ver se is not just about looking with your eyes. It means checking the condition of something.

Examples:

• Veja se a porta está aberta. = Check if the door is open.
• Vou ver se ele chegou. = I’ll check whether he arrived.

So in this sentence, ver se is best understood as check whether or make sure.

Because there are two separate whether/if clauses:

• se a gaveta está fechada
• se o fogão está limpo

Repeating se makes the structure clear and sounds natural.

In some contexts, speakers may omit the second se if the meaning stays clear, but repeating it is very common and often better style here.

So:

• ver se a gaveta está fechada e se o fogão está limpo = very clear and natural

Portuguese uses definite articles more often than English.

So even where English might say:

• check if drawer is closed
• check if stove is clean

Portuguese normally says:

• a gaveta
• o fogão

This is especially common when talking about specific, familiar objects in a known context, such as things in your house.

Because closed and clean are treated as states or conditions, not permanent characteristics.

In Portuguese:

• estar is usually used for states, conditions, and situations
• ser is usually used for identity, essence, or more permanent characteristics

So:

• A gaveta está fechada. = The drawer is closed.
• O fogão está limpo. = The stove is clean.

Using ser here would sound wrong or unnatural.

Because adjectives in Portuguese usually agree with the noun in gender and number.

• gaveta is feminine singular, so: fechada
• fogão is masculine singular, so: limpo

Compare:

• a porta fechada
• o livro fechado
• a cozinha limpa
• o fogão limpo

This agreement is one of the most important things English speakers need to get used to in Portuguese.

Not naturally in this sentence, because the two adjectives belong to two different subjects:

• a gaveta está fechada
• o fogão está limpo

Each subject needs its own verb.

You can share one está only when the same subject has multiple adjectives:

• O fogão está limpo e seco.

But here the subjects are different, so repeating está is the normal structure.

Because Antes de sair is an introductory phrase at the beginning of the sentence.

Portuguese often uses a comma after this kind of opening element, especially when it sets the time or condition for the main clause.

So:

• Antes de sair, você tem que...

This is natural and standard punctuation.

Yes. Both are possible.

• Antes de sair... = before leaving / before you leave
• Antes de você sair... = before you leave

The version without você is shorter and very common when the subject is already understood. The version with você is more explicit.

In this sentence, Antes de sair sounds very natural.

A few useful points:

• você has stress on the last syllable: vo-CÊ
• está has stress on the last syllable: es-TÁ
• fogão has stress on the last syllable: fo-GÃO

The accent marks help show stress and sometimes vowel quality:

• ê in você marks a stressed vowel
• á in está marks the stressed a
• ão in fogão is nasal, a very common Portuguese sound

For many learners, ão is one of the trickiest sounds in Brazilian Portuguese, so fogão is a good word to practice.