Aunque esté cansado, intento revisar el borrador de mi presentación antes de dormir.

Because aunque can trigger either the indicative or the subjunctive, depending on how the speaker presents the information.

Here, aunque esté cansado uses the subjunctive because the tiredness is presented as a circumstance being conceded rather than simply stated as a straightforward fact. It has a sense like:

• even if I am tired
• although I may be tired
• despite being tired

So esté is the present subjunctive of estar.

Compare:

• Aunque estoy cansado, trabajo. = I am in fact tired, and I still work.
• Aunque esté cansado, trabajo. = Even if I’m tired / whether or not I’m tired, I work.

In real life, the English translation may still simply be Although I’m tired..., but the Spanish grammar shows a slightly different attitude.

Yes. Both are possible, but they are not exactly the same.

• Aunque estoy cansado: the speaker treats being tired as a known, real fact.
• Aunque esté cansado: the speaker presents it more as a conceded circumstance, something not being strongly asserted, or something that does not change the main action.

So:

• Aunque estoy cansado, intento revisar... sounds like I am tired, but I still try to review...
• Aunque esté cansado, intento revisar... sounds more like Even if I’m tired / although I may be tired, I try to review...

Both are natural, but the subjunctive version is often chosen when the speaker wants to focus less on the factuality of the first clause and more on the effort in the main clause.

Because cansado has to agree with the person being described.

If the speaker is male, you say:

• estoy cansado
• aunque esté cansado

If the speaker is female, you say:

• estoy cansada
• aunque esté cansada

This is adjective agreement in Spanish: adjectives usually change form to match gender and number.

Because estar is used for states or conditions, and being tired is a temporary condition.

So:

• estar cansado = to be tired

By contrast, ser cansado would not mean to be tired. It would mean something more like to be tiring or to be tedious, describing the nature of something.

For example:

• Estoy cansado = I am tired
• El trabajo es cansado = The work is tiring

That is a very common ser vs estar distinction.

Because Spanish often leaves out subject pronouns when they are not needed.

In intento revisar, the verb ending -o already tells you the subject is I. So yo is optional.

• Intento revisar... = I try to review...
• Yo intento revisar... = same basic meaning, but yo adds emphasis or contrast

Spanish usually avoids pronouns unless the speaker wants to stress them, contrast them with someone else, or prevent ambiguity.

Because intentar is directly followed by an infinitive in Spanish.

So the normal pattern is:

• intentar + infinitive

Examples:

• intento revisar
• intentas aprender
• intentamos terminar

You do not put de after intentar in standard Spanish.

This is similar to English try to review, but in Spanish the structure is simply try + infinitive.

Revisar here means to review, to check, or to go over something.

In this sentence, it suggests looking over the draft to correct or improve it.

It overlaps with repasar, but there is a slight difference:

• revisar often suggests checking carefully, inspecting, correcting, editing
• repasar often suggests going over material again, especially for study or rehearsal

So for a presentation draft:

• revisar el borrador = review/check the draft
• repasar la presentación = go over the presentation, perhaps to practise or refresh your memory

Both can be possible in some contexts, but revisar fits especially well with borrador.

Borrador means draft.

In this sentence, el borrador de mi presentación means the not-final version of the presentation: the version you are still editing, correcting, or improving.

Common uses of borrador:

• el borrador de un ensayo = the draft of an essay
• el borrador de un correo = the draft of an email
• el borrador de mi presentación = the draft of my presentation

Be careful: borrador can also mean eraser in some contexts, especially in school language, so context matters.

Because el borrador de mi presentación is the most straightforward way to say the draft of my presentation.

The structure is:

• el borrador = the draft
• de mi presentación = of my presentation

This makes it clear that the draft belongs to or relates to the presentation.

You could sometimes hear other structures, but el borrador de mi presentación is very natural and standard.

Also note that Spanish often uses possessives like mi where English uses them, so mi presentación is perfectly normal.

Because antes needs de before an infinitive.

The pattern is:

• antes de + infinitive

So:

• antes de dormir = before sleeping
• antes de salir = before leaving
• antes de empezar = before starting

You cannot say antes dormir in standard Spanish.

Antes de dormir is a general, neutral way to say before sleeping or before going to sleep.

You could also say antes de dormirme, but that changes the nuance slightly.

• antes de dormir = before sleeping / before going to bed
• antes de dormirme = before I fall asleep

The version with -me is more explicitly about the speaker personally falling asleep. The version without it is broader and more idiomatic in many cases.

So antes de dormir sounds very natural here.

Yes. Spanish word order is fairly flexible.

The original sentence:

• Aunque esté cansado, intento revisar el borrador de mi presentación antes de dormir.

You could also say:

• Intento revisar el borrador de mi presentación antes de dormir, aunque esté cansado.

Both are grammatical. The difference is mainly one of emphasis and flow.

• Starting with Aunque esté cansado highlights the obstacle first.
• Putting it at the end makes the main action come first.

The original version sounds very natural and elegant.

Yes, it sounds natural in Spain.

Everything in the sentence is standard and idiomatic:

• aunque esté cansado
• intento revisar
• el borrador de mi presentación
• antes de dormir

A speaker in Spain would understand it immediately. Depending on context, someone might choose a slightly different verb or noun, such as repasar instead of revisar, but the sentence as given is completely natural.