yo dudo

I doubt

→ dudar
dud doubt + o 1st-person singular present (indicative or subjunctive)
verb · first singular · present indicative Uncommon #20,722
I doubt
SP: Dudo que hoy llueva.
EN: I doubt it will rain today.
Conjugation of dudar
Indicative present
SingularPlural
First dudo —
Second dudas —
Third duda —
Subjunctive present
SingularPlural
First dudo —
Second dudas —
Third duda —

Dudo incluso mientras escribo esta carta.

I have doubts even as I write this letter.

— Sympathy for Mr. Vengeance (2002)

Aunque estés rico, dudo que seas feliz.

Even if you're rich, I doubt you're happy.

No dudo de ti.

I don't doubt you.

Si tienes algo de tiempo, cosa que dudo, hecha un vistazo a esto.

If you have some time, which I doubt, take a look at this.

Dudo seriamente que esto funcione.

I seriously doubt this will work.

— ¡Que te den profe! (2013)

Aunque a veces dudo si no los obligan.

Although sometimes I wonder if they aren't being forced.

— Taxi Express (1998)

Dudo mucho que haya terminado el informe a tiempo para la presentación.

I highly doubt I finished the report in time for the presentation.

No dudo en su capacidad para hacerlo.

I don't doubt his ability to do it.

Dudo si él llegará a tiempo.

I doubt he'll arrive on time.

Dudo que él venga.

I doubt he'll come.

Dudo la sinceridad de tu amistad.

I doubt the sincerity of your friendship.

No dudo en decir la verdad.

I don't hesitate to tell the truth.

Dudo si acaso será verdad o no.

I doubt whether it's true or not.

Dudo mucho que nos volvamos a ver.

I highly doubt we'll see each other again.

— Battle Royale (2000)

Dudo que él venga a tiempo.

I doubt he'll come in time.

Dudo sobre qué oración es gramaticalmente correcta.

I'm unsure which sentence is grammatically correct.