Questions & Answers about Я считаю этот урок интересным.
Считать has two main meanings in Russian:
To count (do arithmetic):
- Я считаю деньги. – I am counting the money.
To consider / to regard / to think of something as:
- Я считаю этот урок интересным. – I consider this lesson (to be) interesting.
In your sentence it has the second meaning: you are expressing an opinion/judgment about the lesson, not doing math.
Этот урок is in the accusative because it is the direct object of the verb считать in the meaning “to consider.”
Structure:
- Я – subject (nominative)
- считаю – verb
- этот урок – direct object (accusative)
- интересным – what you consider the object to be (predicate in instrumental)
This pattern is standard:
- Я считаю его хорошим учителем. – I consider him a good teacher.
- его – accusative (object)
- хорошим учителем – instrumental (what you consider him to be)