Учитель расставил парты в кабинете.

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Breakdown of Учитель расставил парты в кабинете.

• учитель: the teacher
• кабинет: the classroom
• парта: the desk

Questions & Answers about Учитель расставил парты в кабинете.

Which word is the subject, which is the object, and what is в кабинете?

• Учитель – subject (nominative singular): the teacher
• расставил – verb (past tense, masculine, perfective): arranged / set up
• парты – direct object (accusative plural): the desks
• в кабинете – prepositional phrase of place: in the classroom / in the room

What exactly does расставил mean, and how is it different from just поставил?

Расставил (from расставить) means to arrange, to set things in order, to place them in specific positions relative to each other.
Nuance:

• поставил – simply put/placed something somewhere (focus on the act of putting).
• расставил – arranged/positioned several objects in a certain order or pattern (focus on order and distribution).

So Учитель расставил парты suggests the teacher organized the desks, not just placed one somewhere.

What tense and aspect is расставил, and what is its imperfective partner?

• расставил is past tense, masculine singular, perfective aspect.
• The imperfective partner is расставлять.

Aspect difference: