Questions & Answers about Non sappiamo come dedurre la sequenza esatta.
Since this lesson is about negative statements triggering the subjunctive, why isn't the subjunctive used here?
The subjunctive is triggered when a negative statement of certainty is followed by che and a new clause, usually with a different subject (e.g., Non sappiamo che lui lo deduca - 'We do not know that he is deducing it'). Here, the sentence uses an interrogative word (come) followed by an infinitive. This is the standard grammatical structure for expressing that you don't know how to do something.
Could we just say Non sappiamo dedurre without come?
Yes, but the nuance shifts slightly. Non sappiamo come dedurre focuses on lacking the method, clues, or instructions in this specific case. If you drop come, Non sappiamo dedurre sounds more like a general lack of ability or skill, meaning 'We don't know how to deduce' (as in, we are bad at deducing things in general).
Why is sapere used here instead of conoscere?
Could the adjective esatta go before the noun instead (l'esatta sequenza)?