Ha giurato, ma non credo a quel bugiardo.

From Lesson 193:Future in the past·Italian

Questions & Answers about Ha giurato, ma non credo a quel bugiardo.

Why is there an a before quel bugiardo when the English translation just says "I don't believe that liar"?
In Italian, the verb credere requires the preposition a when you mean "to believe a person" or "to trust someone". You are literally saying "I don't believe to that liar" (non credo a quel bugiardo).
Why does the sentence use quel instead of quello?
When used as an adjective before a noun, quello changes its form to match the definite article that the noun would take. Because the masculine singular noun bugiardo takes the article il (il bugiardo), the adjective form becomes quel. You generally only use the full word quello before a noun if it starts with "Z" or "S + consonant" (where you would use lo), or when it stands alone as a pronoun.
This lesson is about using the past conditional for a "future in the past" (like "He swore he would change"). Why isn't there a past conditional here?
The past conditional is only needed when a past action introduces a reported action that happened later (for example, ha giurato che lo avrebbe fatto meaning "he swore that he would do it"). In this sentence, ha giurato stands alone as a simple statement. Because it doesn't introduce a secondary future action, no conditional is needed.
Why does giurare take avere (ha giurato) as its helper verb here, even though there's no direct object?
Verbs of communicating, speaking, and declaring (like giurare, parlare, and rispondere) take avere in the passato prossimo. They use this helper verb regardless of whether a direct object is actually written out in the sentence.

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