Questions & Answers about Мы гуляли вокруг глубокого озера.
Why do the words 'глубокое озеро' change to 'глубокого озера' in this sentence?
The preposition вокруг (around) requires the following noun and any attached adjectives to take the Genitive case. Since озеро (lake) is a neuter noun, its Genitive singular form becomes озера. The matching neuter Genitive adjective ending is -ого, giving us глубокого.
How is the ending of глубокого pronounced?
Even though it is spelled with a г (-ого), it is pronounced like an English 'v' (-ово). This is a strict pronunciation rule in Russian for masculine and neuter adjective endings in the Genitive case.
Wait, doesn't озера mean 'lakes' in the plural?
It looks very similar when written without stress marks, but it is singular here! The Genitive singular of озеро is озера (with the spoken stress on the first syllable: о́зера). The plural form 'lakes' is озёра (with a ё, where the stress always falls). So in this sentence, we are walking around just one lake.
Could we use a perfective verb here instead of гуляли?
Yes, but it changes the nuance. The imperfective гуляли focuses on the ongoing process or activity of strolling around the lake. If you wanted to say you took a short walk around it and finished, you could use the perfective погуляли.