Θεωρείται ότι η ανάγνωση βιβλίων είναι πολύ αποτελεσματική για τη μνήμη.

to be

Breakdown of Θεωρείται ότι η ανάγνωση βιβλίων είναι πολύ αποτελεσματική για τη μνήμη.

• πολύ: very
• για: for
• το βιβλίο: the book

Questions & Answers about Θεωρείται ότι η ανάγνωση βιβλίων είναι πολύ αποτελεσματική για τη μνήμη.

What exactly does Θεωρείται mean here, and what form of the verb is it?

Θεωρείται means “is considered”.

Grammatically:

• It is the 3rd person singular, present tense, passive voice of the verb θεωρώ (to consider).
• θεωρώ (active) = I consider
• θεωρείται (passive) = it is considered

So Θεωρείται ότι… literally means “It is considered that…”, just like English “It is considered that reading books is very effective for memory.”

Why is there no subject before Θεωρείται? Who is doing the considering?

In Greek, Θεωρείται is used impersonally, similar to English “It is considered” where “it” doesn’t refer to anything concrete.

• There is no explicit subject like “people” or “they”.
• The idea is: “People in general consider that…”, but Greek leaves that subject understood and uses the passive verb alone.

You could make the subject explicit with the active voice:

• Πολλοί θεωρούν ότι η ανάγνωση βιβλίων είναι πολύ αποτελεσματική για τη μνήμη.
  = Many people consider that reading books is very effective for memory.

But the original sentence deliberately keeps it impersonal and general: “It is considered that…”

What is the role of ότι in this sentence? Is it the same as English “that”?