Supongo que puedes tener razón.

Since this is theoretical, wouldn’t the verb be ‘tengas?’ Confused!

I can’t explain why, but verbs such as ‘suponer’, ‘creer’, ‘pensar’, etc. are used with the indicative unless negated. This is something that differentiates Spanish from Italian, which favors the subjunctive.

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I’m sorry, but I’m a little confused now (Spanish isn’t one of my stronger languages).

Doesn’t the explanation from @morbrorper relate to puedes (indicative) vs puedas (subjunctive).

Shouldn’t tener always be in the infinitive, with only the modal verb poder inflecting?

To add to what @morbrorper has already explained, I found this explanation in an old WordReference forum thread:

Sí es correcto el verbo suponer con indicativo.

Además del tiempo presente, se emplea el futuro perfecto o el futuro simple del indicativo para señalar incertidumbre o probabilidad en el pasado o en el presente.

Supongo que habrá salido . (Probabilidad en el pasado)
Supongo que estará saliendo en este momento. (Probabilidad en el presente)

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Yes, but I read the original question as “why isn’t it ‘supongo que tengas razón’”?

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