Questions & Answers about Я полил салат соусом.
Полил is the perfective past form of the verb полить, which means something like to pour onto / to douse / to dress in a completed way.
So Я полил салат соусом presents the action as a single completed event: the speaker poured sauce over the salad.
A related imperfective verb is поливать. If you said Я поливал салат соусом, it would sound more like:
- I was pouring sauce on the salad
- I used to pour sauce on the salad
- I poured sauce on the salad repeatedly
So полил focuses on completion, while поливал focuses on process, repetition, or ongoing action.
In Russian, the past tense is usually formed with -л.
For полить, the past tense stem gives:
- я полил — I poured/dressed
- она полила — she poured/dressed
- оно полило — it poured/dressed
- они полили — they poured/dressed
So -л is the normal marker of the past tense.