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Si hablas rápido y titubeas, tu entonación no es persuasiva.

Si hablas rápido y titubeas, tu entonación no es persuasiva.
If you speak fast and hesitate, your intonation is not persuasive.
From Lesson 364:Adjectives as adverbs·Spanish (Latin America)

Questions & Answers about Si hablas rápido y titubeas, tu entonación no es persuasiva.

Why use rápido here instead of the adverb rápidamente?
In everyday Spanish, several common adjectives can be used to modify verbs without adding the -mente ending. This is called the adverbial use of an adjective. Using rápido directly sounds much more natural and conversational than rápidamente.
If a group of women were speaking, would rápido change to rápidas?
No. When an adjective acts as an adverb to modify a verb, it becomes permanently locked in its masculine singular form. So even if you say ellas hablan rápido, the word rápido does not change to match the speakers.
Why does persuasiva change to match gender, but rápido does not?
This perfectly shows the difference between the two roles. Rápido is modifying the verb hablas (how you speak), making it an adverb, so it stays masculine singular. Persuasiva is modifying the feminine noun entonación, so it acts as a standard adjective and must agree in gender and number.
Does titubeas mean any kind of hesitation?
While it means to hesitate or waver, titubear is especially common when talking about speech (stammering, stuttering, or stumbling over words), which makes it the perfect choice next to hablas. It is also used for mental hesitation or doubt.
Since the sentence sets up a hypothetical 'if' condition, why isn't hablas in the subjunctive?
In Spanish, si is only followed by the subjunctive when describing impossible or highly unlikely scenarios (like 'If I were you'). For open, realistic conditions like this one (where you very well might speak fast and hesitate), si always triggers the present indicative mood.

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