tells the truth
I think he's telling the truth.
Now he's telling me the truth.
Apuesto a que no dice la verdad.
I bet he's not telling the truth.
Bush dice la verdad.
Bush is telling the truth.
If they're telling the truth, then...
— Una historia china de fantasmas (1987)
Now he's telling me the truth.
Mentiroso es alguien que no dice la verdad.
A liar is someone who doesn't tell the truth.