Breakdown of Она редко ходит в бассейн.
она
she / it (for a feminine noun)
в
in / to (direction)
ходить
to walk, go on foot (multidirectional)
редко
rarely
Questions & Answers about Она редко ходит в бассейн.
Why does this sentence use ходит instead of идёт?
The word редко (rarely) shows this is a repeated or habitual action, not a one-time trip happening right now. For habits and round trips, we use the multidirectional verb ходить. If she were walking to the pool right at this moment, we would use идёт.
Could I use ездит instead of ходит here?
You could, but only if you specifically want to emphasize that she travels to the pool by vehicle (like a car or bus). Ходит literally means going on foot, but it is also the default verb for regularly attending places in your town, like the pool or school, regardless of how you actually get there.
Why do we need the preposition в before бассейн?
In English, we say "goes to the pool". In Russian, to show the destination or direction of motion, we use the preposition в (into/to) or на (onto/to) followed by the Accusative case. Because a pool is an enclosed space or a building, it takes в.
Is бассейн in the Accusative case here? It looks like the dictionary form.
Yes, it is in the Accusative case! For masculine inanimate nouns (objects and places, not living beings), the Accusative form is identical to the Nominative (dictionary) form. That is why бассейн does not change its ending here.