Questions & Answers about Jag finner det orimligt att missförstå teorin.
Why do we need the word det in this sentence?
Here, det acts as a "formal object" (a placeholder). The real object of the sentence is the entire infinitive clause at the end: att missförstå teorin. Because Swedish prefers not to put long clauses right in the middle of a sentence, we use det to hold the object's place right after the verb, and move the actual action to the end.
Why does orimligt have a -t at the end instead of just being orimlig?
Adjectives must agree with the noun or pronoun they describe. Since orimligt (unreasonable) describes the placeholder det (which is a neuter word), it gets the neuter -t ending.
Could I use tycker instead of finner to say "I find it unreasonable"?
You can use tycker, but the grammar changes. You would typically say Jag tycker att det är orimligt... (I think that it is unreasonable...). The verb finner allows you to attach the evaluation directly to the object (finner det orimligt), exactly matching the English structure "I find it unreasonable". It sounds slightly more formal.
Is the prefix miss- in missförstå the same as the English "mis-"?