Сестра жарит омлет с грибами быстрее, чем я.

My sister fries an omelet with mushrooms faster than I do.

Breakdown of Сестра жарит омлет с грибами быстрее, чем я.

• я: I
• с: with
• сестра: the sister
• чем: than

Questions & Answers about Сестра жарит омлет с грибами быстрее, чем я.

What does жарит tell me about tense and aspect? Can it mean both is frying and fries?

Yes. Жарит is:

• 3rd person singular
• present tense
• from the imperfective verb жарить

Because it is imperfective, it can describe either:

• an action happening right now: is frying
• a habitual/repeated action: fries

Russian does not have a separate built-in progressive form like English is frying, so context tells you which meaning is intended.

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Why is омлет unchanged? What case is it in?

Омлет is in the accusative singular because it is the direct object of жарит.

The reason it looks unchanged is that омлет is:

• masculine
• inanimate

For most masculine inanimate nouns in Russian, the accusative singular is the same as the nominative singular.

So:

• nominative: омлет
• accusative: омлет

That is completely normal.

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Why is it с грибами? What case is грибами?