Quero entrar no clube.

In Portuguese, the subject pronoun is often omitted when it is clear from the verb ending.

• Quero already means I want
• so Quero entrar no clube naturally means I want to enter/join the club

You can say Eu quero entrar no clube, but adding eu gives extra emphasis or contrast, for example:

• Eu quero entrar no clube, mas ele não.
  I want to join the club, but he doesn’t.

So the version without eu is very normal and natural.

Quero is the 1st person singular (I) form of the verb querer (to want).

Present tense of querer:

• eu quero — I want
• você / ele / ela quer — you / he / she wants
• nós queremos — we want
• vocês / eles / elas querem — you all / they want

So:

• Quero entrar no clube = I want to enter/join the club

After a verb like querer (to want), the next verb usually stays in the infinitive.

So:

• quero entrar = I want to enter
• quero falar = I want to speak
• quero comer = I want to eat

This is similar to English want + to + verb, except Portuguese does not use a separate word like to before the second verb here.

It can suggest either, depending on context.

• entrar no clube can literally mean to enter the club (go inside)
• but it can also mean to join the club (become a member)

If the meaning shown to the learner is already clear, that will determine which one is intended. In everyday use, Portuguese often allows this kind of ambiguity, and context resolves it.

If you specifically want become a member, another common expression is:

• Quero me associar ao clube. — I want to join the club / become a member of the club.

No is a contraction of:

• em + o = no

So:

• no clube = in the club / into the club / at the club, depending on context

Portuguese often uses an article where English does not.
That is why the club appears as o clube, and after em it becomes no clube.

Compare:

• o clube — the club
• em o clube — not normally said separately
• no clube — in/at/to the club

Portuguese and English do not always use the same prepositions.

With entrar, Portuguese commonly uses em:

• entrar em um lugar
• entrar no clube
• entrar na sala
• entrar em casa

Even though English often says enter the club or go into the club, Portuguese naturally uses em with this verb in many contexts.

So entrar no clube is the normal structure.

Normally, no.

With entrar, the usual choice is em:

• entrar no clube
• entrar na escola
• entrar em casa

The form ao comes from a + o, but entrar usually does not take a in this sense.

So for a learner, the safest pattern is:

• entrar em + place
• em + o = no
• em + a = na

Yes, clube is masculine:

• o clube — the club

That is why:

• em + o clube = no clube

You usually learn the noun together with its article:

• o clube
• a casa
• o livro
• a escola

That helps you remember gender and use contractions correctly.

A natural Brazilian Portuguese pronunciation is approximately:

• KEH-roh en-TRAR noh KLOO-bee

A few helpful notes:

• quero: the que sounds like keh
• entrar: stress is on the last syllable, -trar
• no: sounds like noh
• clube: in Brazilian Portuguese, the final e is usually pronounced, roughly KLOO-bee

This is only an approximation for English speakers, but it is a useful starting point.

Not in natural English. The natural English structure is:

• I want to enter the club
• I want to join the club

But in Portuguese, after quero, you simply use the infinitive:

• quero entrar

So Portuguese does not need an extra word equivalent to English to in this pattern.

Yes, but only slightly.

• Quero entrar no clube sounds neutral and natural.
• Eu quero entrar no clube puts more focus on I.

That extra pronoun can sound like:

• emphasis
• contrast
• clarification

For example:

• Eu quero entrar no clube; ela quer sair.
  I want to join the club; she wants to leave.

Without special emphasis, omitting eu is very common.

Put não before the conjugated verb:

• Não quero entrar no clube. — I don’t want to enter/join the club.

This is the normal way to negate the sentence in Portuguese.

Pattern:

• Quero entrar no clube. — I want to enter the club.
• Não quero entrar no clube. — I don’t want to enter the club.

In spoken Brazilian Portuguese, you usually keep the same word order and let intonation show it is a question:

• Quero entrar no clube?
  depending on context, this could sound like Do I want to join the club? or an echo question

More naturally, if you want to ask Do you want to join the club?, you would change the subject/verb:

• Você quer entrar no clube?

If you want to ask Do I want to join the club?, that is less common as a normal question, but possible in special contexts.

So for beginners, the key point is: Portuguese often forms yes/no questions with intonation, not by changing word order.

Yes. A few close alternatives are:

• Quero entrar para o clube.
• Quero fazer parte do clube. — I want to be part of the club.
• Quero me associar ao clube. — I want to join the club / become a member.

These are not always identical in nuance:

• entrar no clube can be literal or figurative
• fazer parte do clube stresses belonging
• me associar ao clube sounds more specifically like becoming a member

So Quero entrar no clube is a good, simple sentence, but context may make another version more precise.