Aunque estés cansado, tienes que atar el silbato a la mochila.

Questions & Answers about Aunque estés cansado, tienes que atar el silbato a la mochila.

Why do we use the subjunctive estés instead of the indicative estás after aunque?
When aunque is followed by the subjunctive, it describes a hypothetical or unverified situation, translating to 'even if'. So aunque estés cansado means 'even if you might be tired'. If we used the indicative here (aunque estás cansado), it would declare a known fact, meaning 'although you are tired'.
Could I say Aunque seas cansado instead?
No, you need to use the verb estar because being tired is a temporary physical state or condition. Therefore, we use estés, the subjunctive form of estar, rather than seas (which comes from ser).
Why is there a que in tienes que atar?
In Spanish, to say you 'have to' or 'must' do something, you use the fixed phrase tener que followed by an infinitive (unconjugated) verb. Here, tienes que gives us 'you have to', and atar is the infinitive 'to tie'.
Why do we use the preposition a in atar el silbato a la mochila?
The verb atar (to tie) generally uses the preposition a to show what an object is being attached or secured to. It works just like English in this case: tying the whistle to (a) the backpack.

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