Se esta tecla continuar estranha, vou desconectar o teclado e chamar a técnica.

Here continuar is best understood as the future subjunctive, not the infinitive.

After se meaning if, Portuguese often uses the future subjunctive when talking about a possible future situation:

• Se esta tecla continuar estranha...
• If this key keeps being strange...

For regular -ar verbs, the future subjunctive looks exactly like the infinitive, so continuar has the same form in both cases.

Compare with an irregular verb, where you can see the difference more clearly:

• Se ele for... = If he goes / if he is
• Se ela tiver... = If she has

So in this sentence, continuar is not just a dictionary form floating there; it is the normal verb form used after se in a future condition.

Here se means if.

It introduces a condition:

• Se esta tecla continuar estranha...
• If this key keeps acting strange...

This is one of the most common uses of se in Portuguese.

Both esta and essa are demonstratives, like this and that.

Traditionally:

• esta = this, near the speaker
• essa = that, near the listener or already mentioned

So esta tecla suggests this key here.

In real Brazilian Portuguese, though, the distinction is often looser, and many speakers use essa where older grammar rules might prefer esta. So esta tecla is correct and natural, but essa tecla might also be heard in everyday speech depending on context and region.

Because it agrees with tecla, which is a feminine singular noun.

Agreement in Portuguese means adjectives usually match the noun in gender and number:

• a tecla estranha
• o teclado estranho
• as teclas estranhas

So:

• tecla = feminine singular
• estranha = feminine singular

That is why it is not estranho.

Estranha is an adjective here.

The verb continuar can work like to remain or to keep being, linking the subject to a description. In that kind of structure, Portuguese uses an adjective, not an adverb:

• A tecla continua estranha.
• The key remains strange.

So estranha describes tecla.

This is similar to English sentences like:

• The key is strange
• The key remains strange

Literally, yes, estranha means strange, odd, or weird.

But with a device or piece of equipment, it often means something like:

• acting weird
• not behaving normally
• malfunctioning in an odd way

So in this sentence, it probably does not mean the key is philosophically mysterious. It means the key is behaving abnormally.

Portuguese often leaves out subject pronouns when the verb already makes the subject clear.

• (Eu) vou desconectar o teclado
• I am going to disconnect the keyboard

Since vou clearly shows first person singular, eu is not necessary.

If you add eu, it can sound more explicit or emphatic:

• Eu vou desconectar o teclado.

Both are correct.

Because ir + infinitive is extremely common in Brazilian Portuguese, especially in everyday speech.

So:

• vou desconectar = I’m going to disconnect
• desconectarei = I will disconnect

Both can express future meaning, but vou desconectar sounds more natural and conversational in most spoken Brazilian Portuguese.

The simple future often sounds more formal, written, or stylistically stronger.

Portuguese often uses the definite article where English might not.

Here o teclado means the keyboard, referring to the specific keyboard involved in the situation.

That article is very natural in Portuguese with direct objects when the thing is specific and known from context.

So:

• desconectar o teclado = disconnect the keyboard

Not using the article here would usually sound less natural.

They are related but not the same:

• tecla = key
• teclado = keyboard

So the sentence starts with a problem in one key, and the speaker then decides to disconnect the whole keyboard.

That shift is important:

• esta tecla = this key
• o teclado = the keyboard

Yes, técnica can mean technique, but here it means female technician.

Context makes that clear:

• chamar a técnica = call the technician

After chamar, with the article a, it naturally refers to a person in this sentence.

Related forms:

• o técnico = male technician
• a técnica = female technician
• a técnica = technique, method

So this is one of those cases where context decides the meaning.

Yes. That would mean call the male technician.

The difference is just gender:

• chamar o técnico = call the male technician
• chamar a técnica = call the female technician

So the original sentence suggests the person being called is a woman.

Because the sentence begins with a conditional clause:

• Se esta tecla continuar estranha, ...

In Portuguese, when a clause like if..., when..., or although... comes before the main clause, it is normally separated by a comma.

So this punctuation is standard and natural.

Yes, and it would be grammatical, but the nuance changes a little.

• Se esta tecla continuar estranha = if this key keeps being strange / continues acting strange
• Se esta tecla estiver estranha = if this key is strange

So continuar suggests the problem is ongoing, not just present at one moment. It sounds like the key has already been acting oddly, and if that continues, the speaker will take action.

That makes continuar a very good choice here.