Breakdown of Услышав трудный вопрос, он задумался.
он
he / it (for a masculine noun) / it (for a neuter noun)
трудный
difficult
вопрос
question
услышать
to hear (perfective)
задуматься
to get lost in thought
Questions & Answers about Услышав трудный вопрос, он задумался.
How do the prefix за- and the ending -ся change the verb думать in this sentence?
This is a perfect example of the 'absorption' action type. While думать simply means 'to think,' wrapping the verb in за- and -ся gives the idea of getting carried away or fully absorbed by the action. So, задумался means he 'got lost in thought' or 'fell into deep thought.'
Would it make sense to use подумал instead of задумался here?
You could, but it changes the meaning. Он подумал just means 'he thought (for a bit)' — a simple, completed action. Given that it was a difficult question (трудный вопрос), задумался works much better because it shows he had to pause and become deeply mentally absorbed in reflecting on it.
What exactly is the form of Услышав, and how do I make it?
Услышав is a perfective verbal adverb (often called a gerund), translating to 'having heard.' It indicates an action completed before the main action (задумался) took place. You form it by taking the past tense masculine form of a perfective verb (услышал), dropping the -л, and adding -в.
Why is there a comma after вопрос?
In Russian, phrases that start with a verbal adverb (like Услышав трудный вопрос) must always be set off by commas. Unlike in English, this punctuation rule is very strict and applies no matter where the phrase appears in the sentence.
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