Using the normal verb form

When you use 'dudo que' (I doubt that), the next verb must be in the 'special uncertainty form' (the subjunctive) because you are expressing a non-fact. Example: 'Dudo que él *esté* aquí'.

Doubt triggers uncertainty

To emphasize strong skepticism, add 'mucho' immediately after 'dudo': 'Dudo mucho que funcione' (I really doubt it will work).

When in doubt, use 'mucho'

Extremely common way to express personal uncertainty or skepticism.

Learn the meaning of the Spanish verb 'dudo' ('I doubt'), its full conjugation (from the verb 'dudar'), and essential grammar tips on why it triggers the subjunctive mood.

dudo

Complete Conjugation Tables

🔄 Conjugations

indicative

present

future

imperfect

conditional

preterite

imperative

negative

affirmative

subjunctive

present

imperfect

Practice Conjugations