How to Say "one guesses" in Spanish
The Spanish word for “one guesses” is “supone” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
VerbB1
making a guess

Examples
Mi madre supone que llegaré tarde, como siempre.
My mother assumes I'll be late, as always.
El detective supone que el ladrón entró por la ventana.
The detective supposes the thief entered through the window.
Se supone que la tienda abre a las nueve.
The store is supposed to open at nine.
Adding Extra Info with 'que'
Very often, 'supone' is followed by 'que' to introduce the thing being assumed. Think of 'que' as the word 'that' in English: 'She assumes that...' becomes 'Ella supone que...'
Forgetting the 'g' in the 'I' form
Mistake: “Saying 'yo supono'.”
Correction: The 'I' form is irregular: 'yo supongo'. It's like 'pongo' from 'poner' (to put).
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