No. 376 in Greek

οποίου

"Οποίου" means "of which" or "of whom" in English.

In a sentence

Ο φίλος του οποίου το βιβλίο δανείστηκα είναι πολύ καλός.
The friend whose book I borrowed is very kind.
The word 'οποίου' here is used to indicate possession or relation to 'το βιβλίο', which belongs to 'ο φίλος' (the friend). This showcases the genitive case for constructing dependent clauses.
Ο μαθητής οποίου οι εργασίες ολοκληρώθηκαν νωρίς ήταν επιμελής.
The student whose assignments were completed early was diligent.
In this sentence, 'οποίου' is again demonstrating possession or association, with 'οι εργασίες' (the assignments) relating to 'ο μαθητής' (the student).
Ο δάσκαλος οποίου η μέθοδος διδασκαλίας είναι αποτελεσματική είναι αγαπητός στους μαθητές.
The teacher whose teaching method is effective is liked by the students.
Here, 'οποίου' highlights the relation between 'η μέθοδος διδασκαλίας' (the teaching method) and 'ο δάσκαλος' (the teacher), showing the possessive relationship in the genitive.

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