Вчера я узнал его адрес.

Questions & Answers about Вчера я узнал его адрес.

Why do we use the perfective verb узнал here instead of an imperfective verb?
In this sentence, finding out the address is a single, completed action with a clear result: you now know the address. Perfective verbs are used for these one-time, finished events. The imperfective version (узнавал) would mean "I was finding out" or "I used to find out."
How would this sentence change if a woman was speaking?
In the Russian past tense, verbs change their endings based on the gender of the person doing the action. узнал is the masculine form. If a woman is speaking, she would add an -а to the end of the verb, making it: Вчера я узнала его адрес.
адрес is the direct object being found out. Why didn't its ending change?
You are right that адрес is the direct object, which puts it in the Accusative case. However, адрес is a masculine inanimate noun (a non-living thing). For masculine inanimate nouns, the Accusative case form looks exactly the same as the basic dictionary form.
How do you pronounce его, and does it change to match адрес?
The word его means "his" here, and it is pronounced "ye-VO" because the letter г is spoken as a "v" sound in this word. Unlike regular adjectives, его is a fixed possessive word that never changes its ending to match the noun it describes.

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