Breakdown of Как только гости приехали, собака спряталась.
собака
dog
гость
guest
приехать
to arrive (by transport, pf)
как только
as soon as
спрятаться
to hide (perfective)
Questions & Answers about Как только гости приехали, собака спряталась.
Why do we use the perfective verbs приехали and спряталась in this sentence?
The phrase как только (as soon as) is used here to show that one completed event immediately triggered another. Because both actions are finished, one-time events—the guests arrived, and then the dog hid—we use the perfective aspect for both.
Why is the verb спряталась reflexive (ending in -сь)?
Could I use the imperfective verb ехали instead of приехали here?
Not in this context. The imperfective ехали means the guests "were traveling" or "were on their way". To trigger the dog hiding "as soon as" they did something, their arrival must be a completed action. The prefix при- adds the meaning of arrival and makes the verb perfective.
Is the comma after приехали strictly necessary?
Yes, it is mandatory! Unlike English, where you can sometimes skip commas, Russian punctuation rules strictly require you to separate a subordinate clause (the part starting with как только) from the main clause with a comma.
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