Questions & Answers about Lo devo firmare se il contratto è pronto.
The lesson is about conditionals with "se", but this sentence only uses the present tense. Is that correct?
Yes! For a "real" condition (First Conditional), you can use the present tense in both parts of the sentence if you are talking about a general fact or an immediate action. Se il contratto è pronto (If it is ready right now), lo devo firmare (I must sign it right now). You can also mix present and future tenses depending on exactly when the actions happen.
Why is "lo" at the very beginning? Could I say "Devo firmarlo" instead?
Yes, you absolutely can! When you use a modal verb like dovere (must) with an infinitive like firmare (to sign), you have two choices for a direct object pronoun like lo. You can put it before the conjugated verb (Lo devo firmare) or attach it to the end of the infinitive by dropping the final 'e' (Devo firmarlo). Both are perfectly natural and mean the exact same thing.
How do we know "lo" means "it" here, and not "him"?
Can I flip the sentence and put the "se" part first?