Subjunctive for doubt (dudar que)

Doubting and Denying

Just as you use the subjunctive to express emotions, you also use it to express doubt, disbelief, or denial. When you are not certain that a claim is true, the verb that follows que must be in the subjunctive.

You will use this familiar structure: Expression of Doubt + que + Subjunctive verb

Use the subjunctive after verbs like dudar (to doubt) to show that you are skeptical about a situation:

Denying Claims

When you deny that something is true, you are expressing a strong form of doubt. The verb negar (to deny) also triggers the subjunctive. Notice that negar has a stem change (e to ie) in most present tense forms (niego, niegas, niega, niegan).

To Believe or Not to Believe

When you state what you believe to be a fact with creer que (to believe that), you use the normal indicative mood. However, if you add no to express disbelief (no creer que), you introduce doubt, which requires the subjunctive.