Семинар начинается в восемь часов.

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Breakdown of Семинар начинается в восемь часов.

• начинаться: to start
• час: the hour
• семинар: the seminar

Questions & Answers about Семинар начинается в восемь часов.

What does the verb «начинается» mean exactly, and what is the purpose of the -ся ending?

The base verb is начинать – “to begin, to start” (imperfective).
With -ся it becomes начинаться – “to begin, to start” (intransitively / by itself).

• начинать (что?) – to start something
  
  • Он начинает семинар. – He starts the seminar.
• начинаться – to start (something begins)
  
  • Семинар начинается. – The seminar starts / is starting.

So -ся here marks the reflexive / intransitive form: the seminar “starts” on its own, we don’t name the person who starts it.

Why is «начинается» in the present tense if the seminar is in the future?

Russian often uses the present tense of an imperfective verb for scheduled future events, especially:

• timetables (trains, flights, classes)
• fixed plans (meetings, shows, etc.)

So:

• Семинар начинается в восемь часов.
  – “The seminar starts at eight o’clock.” (future, but scheduled)

It’s grammatically present, but in this context it refers to a fixed future. This is very natural Russian.

What is the difference between «начинается» and «начнётся» here?