Breakdown of Вытряхни песок из ботинок перед входом в дом.
дом
the house
в
to
перед
before
вход
the entrance
Questions & Answers about Вытряхни песок из ботинок перед входом в дом.
Why is вытряхни used here instead of вытряхивай?
Вытряхни is the informal singular imperative of the perfective verb вытряхнуть. It gives a command to do the action once and completely.
So here it means something like:
- Shake the sand out
- Get the sand out with a shake
If you used вытряхивай, that would be the imperfective imperative. It would sound more like:
- keep shaking it out
- shake it out as a repeated/habitual action
- be in the process of shaking it out
For a simple one-time instruction, вытряхни is the natural choice.
What does the prefix вы- add to the verb?
The prefix вы- often adds the idea of out.
- тряхнуть = to give a shake
- вытряхнуть = to shake out
So вытряхни песок из ботинок is literally something like shake the sand out of the boots.
That prefix matches the idea of removing something from inside something else.
Why is there no subject pronoun like ты?
Russian usually leaves out subject pronouns when they are already clear from the verb form.
Here already tells you that the speaker is talking to — basically singular.