Question 1

Why do we use sino here instead of pero?

Accepted Answer

While both translate to "but", sino is specifically used to correct a negative statement. It means "but rather" or "but instead." Because the first part of the sentence is negative (no es una afirmación falsa), you must use sino to introduce the correct alternative (la verdad).

Question 2

Could I use sino que in this sentence?

Accepted Answer

No, because la verdad is just a noun phrase. You only use sino que when the second part of the contrast has a newly conjugated verb. If the sentence were "That is not a false statement, but rather it speaks the truth," you would use sino que because of the new verb: ...sino que dice la verdad.

Question 3

Why does the sentence start with Esa instead of the neuter Eso?

Accepted Answer

Esa is a feminine demonstrative pronoun pointing directly to the feminine noun afirmación (statement). You would use the neuter Eso if you were referring to a general concept, a previously mentioned situation, or an unidentified object, like saying "That is not false" (Eso no es falso).

Question 4

If I flip the sentence to make the first part positive ("That is a false statement, not the truth"), do I still use sino?

Accepted Answer

No, sino is strictly used when the first clause is negative. If you start with a positive statement and want to append a negative contrast, you just use no or y no. For example: Esa es una afirmación falsa, y no la verdad.

Esa no es una afirmación falsa, sino la verdad.

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