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El nudo es muy complicado, no lo puedo desatar.

El nudo es muy complicado, no lo puedo desatar.
The knot is very complicated, I cannot untie it.
From Lesson 311:Logical assumptions (deber de)·Spanish (Spain)

Questions & Answers about El nudo es muy complicado, no lo puedo desatar.

How would I change this sentence to say 'The knot must be very complicated' using the grammar from this lesson?
You would use deber de followed by the infinitive. The sentence would become: El nudo debe de ser muy complicado. This expresses a logical assumption or probability, rather than stating it as an absolute fact like es does.
Why is the pronoun lo placed before puedo instead of attached to desatar?
Both options are perfectly correct. When you have a conjugated verb followed by an infinitive (like puedo desatar), the direct object pronoun can either go right before the conjugated verb (no lo puedo desatar) or be attached directly to the end of the infinitive (no puedo desatarlo).
Why do we use es in es muy complicado instead of está? Isn't a knot being complicated a temporary state?
We use ser (es) because being complicated is viewed as an inherent characteristic of how this specific knot was tied. If you wanted to focus on its current temporary state of being 'tangled,' you would use estar with an adjective like enredado (está muy enredado).
Does the verb desatar follow the same pattern as English words with 'un-'?
Exactly! The base verb is atar, which means 'to tie.' Spanish frequently uses the prefix des- to indicate the reversal of an action, just like the English prefix 'un-'. Therefore, atar becomes desatar (to untie).

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