Ela não revela o segredo antes que tu adivinhes.

Questions & Answers about Ela não revela o segredo antes que tu adivinhes.

Why do we use the subjunctive adivinhes instead of the normal present tense adivinhas?
The phrase antes que (before) always triggers the subjunctive. This is because it introduces an action that hasn't happened yet at the time of the main verb, making it a theoretical or anticipated event rather than a stated fact.
Could I use antes de instead of antes que in this sentence?
Yes, but it changes the grammar. Antes de must be followed by an infinitive verb, not a subjunctive one. To say the exact same thing with antes de, you would use the personal infinitive and say antes de tu adivinhares.
How does the verb adivinhar change to become adivinhes?
To form the present subjunctive for regular -ar verbs, we swap the usual A vowels for E vowels. The normal present tense for tu is adivinhas, so in the present subjunctive, it becomes adivinhes.
Is it mandatory to include the pronoun tu?
It is completely optional. Because the verb ending -es in adivinhes can only ever belong to tu, the pronoun can be dropped without losing any meaning. You will often just hear antes que adivinhes.

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