Conjugation of "Diagnosticar" In Spanish

Spanish -  · Updated July 2026

Conjugation of "Diagnosticar" In Spanish

Diagnosticar is a versatile Spanish verb that can be used in various contexts to convey the meaning of verbs such as "to diagnose." Whether you are learning Spanish as a beginner or looking to expand your conjugation skills, understanding how to properly conjugate "diagnosticar" is essential. In this article, we will provide you with a verb chart that covers all the main tenses and moods of "diagnosticar" to help you navigate its conjugation.

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Forms of "Diagnosticar" in Spanish

In Spanish, verbs play a fundamental role in expressing actions, states, and conditions. Verbs are highly versatile and can take on different forms based on the subject, mood, and tense. The moods of conjugation in Spanish include the indicative, subjunctive, and imperative. When it comes to tenses in Spanish, they indicate the time and duration of an action. The tenses include the present, preterite, imperfect, future, imperative, and conditional. Let us now explain how to conjugate "diagnosticar" in different tenses and moods.  

Indicative Mood: Simple Tenses

Present

  • (Yo) diagnostico
  • (Tú) diagnosticas
  • (Él/Ella) diagnostica
  • (Nosotros/Nosotras) diagnosticamos
  • (Vosotros/Vosotras) diagnosticáis
  • (Ellos/Ellas) diagnostican

Imperfect Past

  • (Yo) diagnosticaba
  • (Tú) diagnosticabas
  • (Él/Ella) diagnosticaba
  • (Nosotros/Nosotras) diagnosticábamos
  • (Vosotros/Vosotras) diagnosticabais
  • (Ellos/Ellas) diagnosticaban

Simple Past

  • (Yo) diagnosticé
  • (Tú) diagnosticaste
  • (Él/Ella) diagnosticó
  • (Nosotros/Nosotras) diagnosticamos
  • (Vosotros/Vosotras) diagnosticasteis
  • (Ellos/Ellas) diagnosticaron

Future

  • (Yo) diagnosticaré
  • (Tú) diagnosticarás
  • (Él/Ella) diagnosticará
  • (Nosotros/Nosotras) diagnosticaremos
  • (Vosotros/Vosotras) diagnosticaréis
  • (Ellos/Ellas) diagnosticarán

Indicative Mood: Perfect Tenses

Present Perfect

  • (Yo) he diagnosticado
  • (Tú) has diagnosticado
  • (Él/Ella) ha diagnosticado
  • (Nosotros/Nosotras) hemos diagnosticado
  • (Vosotros/Vosotras) habéis diagnosticado
  • (Ellos/Ellas) han diagnosticado

Past Perfect

  • (Yo) había diagnosticado
  • (Tú) habías diagnosticado
  • (Él/Ella) había diagnosticado
  • (Nosotros/Nosotras) habíamos diagnosticado
  • (Vosotros/Vosotras) habíais diagnosticado
  • (Ellos/Ellas) habían diagnosticado

Future Perfect

  • (Yo) habré diagnosticado
  • (Tú) habrás diagnosticado
  • (Él/Ella) habrá diagnosticado
  • (Nosotros/Nosotras) habremos diagnosticado
  • (Vosotros/Vosotras) habréis diagnosticado
  • (Ellos/Ellas) habrán diagnosticado

Indicative Mood: Progressive Tenses 

Present Progressive

  • (Yo) estoy diagnosticando
  • (Tú) estás diagnosticando
  • (Él/Ella) está diagnosticando
  • (Nosotros/Nosotras) estamos diagnosticando
  • (Vosotros/Vosotras) estáis diagnosticando
  • (Ellos/Ellas) están diagnosticando

Past Progressive

  • (Yo) estaba diagnosticando
  • (Tú) estabas diagnosticando
  • (Él/Ella) estaba diagnosticando
  • (Nosotros/Nosotras) estábamos diagnosticando
  • (Vosotros/Vosotras) estabais diagnosticando
  • (Ellos/Ellas) estaban diagnosticando

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Subjunctive Mood: Simple Tenses

Present Subjunctive

  • (Yo) diagnostique
  • (Tú) diagnostiques
  • (Él/Ella) diagnostique
  • (Nosotros/Nosotras) diagnostiquemos
  • (Vosotros/Vosotras) diagnostiquéis
  • (Ellos/Ellas) diagnostiquen

Imperfect Subjunctive

  • (Yo) diagnosticara / diagnosticase
  • (Tú) diagnosticaras / diagnosticases
  • (Él/Ella) diagnosticara / diagnosticase
  • (Nosotros/Nosotras) diagnosticáramos / diagnosticásemos
  • (Vosotros/Vosotras) diagnosticarais / diagnosticaseis
  • (Ellos/Ellas) diagnosticaran / diagnosticasen

Subjunctive Mood: Perfect Tenses

Present Perfect Subjunctive

  • (Yo) haya diagnosticado
  • (Tú) hayas diagnosticado
  • (Él/Ella) haya diagnosticado
  • (Nosotros/Nosotras) hayamos diagnosticado
  • (Vosotros/Vosotras) hayáis diagnosticado
  • (Ellos/Ellas) hayan diagnosticado

Past Perfect Subjunctive

  • (Yo) hubiera / hubiese diagnosticado
  • (Tú) hubieras / hubieses diagnosticado
  • (Él/Ella) hubiera / hubiese diagnosticado
  • (Nosotros/Nosotras) hubiéramos / hubiésemos diagnosticado
  • (Vosotros/Vosotras) hubierais / hubieseis diagnosticado
  • (Ellos/Ellas) hubieran / hubiesen diagnosticado

Imperative Mood

Imperative Affirmative

  • (Tú) diagnostica
  • (Usted) diagnostique
  • (Nosotros/Nosotras) diagnostiquemos
  • (Vosotros/Vosotras) diagnosticad
  • (Ustedes) diagnostiquen

Imperative Negative

  • (Tú) no diagnostiques
  • (Usted) no diagnostique
  • (Nosotros/Nosotras) no diagnostiquemos
  • (Vosotros/Vosotras) no diagnostiquéis
  • (Ustedes) no diagnostiquen
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Conditional Mood 

Conditional

  • (Yo) diagnosticaría
  • (Tú) diagnosticarías
  • (Él/Ella) diagnosticaría
  • (Nosotros/Nosotras) diagnosticaríamos
  • (Vosotros/Vosotras) diagnosticaríais
  • (Ellos/Ellas) diagnosticarían

Conditional Compound

  • (Yo) habría diagnosticado
  • (Tú) habrías diagnosticado
  • (Él/Ella) habría diagnosticado
  • (Nosotros/Nosotras) habríamos diagnosticado
  • (Vosotros/Vosotras) habríais diagnosticado
  • (Ellos/Ellas) habrían diagnosticado

Non-Conjugated Moods 

Infinitive

  • Diagnosticar

Gerund

  • Diagnosticando

Participle

  • Diagnosticado

Example Sentences

See how "diagnosticar" is used in real Spanish contexts:

Spanish English
El médico diagnosticó una enfermedad rara en el paciente. The doctor diagnosed a rare disease in the patient.
Su hijo necesita que un especialista lo examine y le diagnostique. Your son needs to be examined and diagnosed by a specialist.
¿Cómo puedo diagnosticar esta condición sin más información? How can I diagnose this condition without more information?
Hemos estado trabajando para diagnosticar el problema durante semanas. We have been working to diagnose the problem for weeks.
No puedo diagnosticar a distancia, necesito verlo en persona. I can't diagnose over the phone; I need to see you in person.
El sistema automático de diagnóstico ha detectado un error crítico. The automatic diagnosis system has detected a critical error.

Usage Notes

"Diagnosticar" is the Spanish verb that means to diagnose, which involves identifying and naming the cause of an illness or problem. It's important to note that "diagnosticar" follows regular conjugation patterns for -ar verbs in all tenses except for stem-changing forms in certain situations (e.g., yo form in present tense: diagnostico).

This verb is commonly used in medical contexts but also applies to technical or mechanical issues. For instance, you might hear it when discussing a car's malfunction or software bugs needing analysis.

While "diagnosticar" can be employed formally and informally, its use tends to lean towards more formal settings due to the nature of its application in professional fields like medicine and technology. Expanding your vocabulary with Spanish Frequency Dictionaries can help you master similar terms used in these contexts.

Conclusion

In conclusion, mastering the conjugation of the verb "diagnosticar" is crucial for effective communication in Spanish. By familiarizing yourself with the verb chart provided for different tenses and moods, you will be able to express yourself accurately and fluently. Keep practicing and incorporating "diagnosticar" into your conversations to enhance your Spanish language skills.


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