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In the direction of; towards

• What did you do to me?

  Что ты со мной сделал?

  Tatoeba · Hybrid · CC BY 2.0 FR

• What are you doing to me?

  Что ты со мной делаешь?

  Tatoeba · Hybrid · CC BY 2.0 FR

к

Indicating destination or final position: In the direction of, so as to arrive at or reach

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Used to indicate the target or recipient of an action

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So as to contact, press against, impact, etc

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So as to become or reach: indicating a terminal state resulting from an action

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So as to bring about or elicit (an effect or outcome)

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Used after an adjective to indicate its application

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Indicating a degree or level reached

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Used to describe what something consists of or contains

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Denotes the end of a range

A particle used for marking the following verb as an infinitive

• It has to be done.

  Это надо сделать.

  Tatoeba · _undertoad · CC BY 2.0 FR

• It had to be done.

  Это должно было быть сделано.

  Tatoeba · CK · CC BY 2.0 FR

As above, with the verb implied

Used to indicate an obligation on the part of, or a directive given to, the subject

A filler word common amongst urban Indians