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Questions & Answers about Supongo que sí.
Why is the verb supongo instead of "supono"?
Why is que needed here? English just says "I suppose so."
In Spanish, verbs of speaking or thinking (like saying, believing, or supposing) almost always need que (that) to connect them to what is being said or thought. While English often drops the word "that" or replaces the idea with "so," Spanish requires que. Literally, this sentence translates to "I suppose that yes."
Can I use que sí with other verbs to say things like "I think so"?
Yes! This is the standard way to agree or express a positive expectation in Spanish. You can use it with many verbs from this lesson, such as creo que sí (I think so), espero que sí (I hope so), or dice que sí (he/she says so). To say the opposite, just use que no (for example, creo que no means "I don't think so").
Why does sí have an accent mark in this sentence?
The accent mark distinguishes sí (yes) from si (if). They sound exactly the same, but without the accent mark, Supongo que si... would mean "I suppose that if..." and would sound like an incomplete sentence to a Spanish speaker.