Сестра взяла блендер и быстро сделала овощной соус.

Russian has no articles, so nouns like сестра can mean sister, a sister, or the sister depending on context.

In this sentence, you understand which one is meant from the situation, not from a separate word. That is very normal in Russian.

Those are past-tense forms, and in Russian the past tense agrees with gender and number.

Because сестра is feminine singular, the verbs are feminine singular too:

• masculine: взял, сделал
• feminine: взяла, сделала
• neuter: взяло, сделало
• plural: взяли, сделали

So сестра взяла and сестра сделала are the correct agreement forms.

Russian aspect is very important here.

Both verbs are perfective, which means the actions are seen as completed events:

• взяла = she took / picked up
• сделала = she made

This sentence tells a simple sequence of finished actions: first she took the blender, then she made the sauce.

If you used imperfective forms such as брала or делала, the meaning would change. It would sound more like process, repetition, background action, or an action without emphasis on completion.

They come from different aspects of the same verb pair:

• брать → imperfective
• взять → perfective

So:

• брала = was taking / used to take / took in an ongoing or repeated sense
• взяла = took, as one completed action

In this sentence, взяла fits because she took the blender once as a completed step before doing the next action.

Блендер is the direct object, so it is in the accusative case. But for inanimate masculine singular nouns, the accusative often looks exactly like the nominative.

So:

• nominative: блендер
• accusative: блендер

That is why you do not see a change here.

Compare with an animate masculine noun, where the accusative would usually match the genitive instead.

Овощной is an adjective meaning vegetable in the sense made from vegetables or relating to vegetables. It must agree with соус, which is masculine singular.

So the forms are:

• masculine singular: овощной соус
• feminine singular: овощная смесь
• neuter singular: овощное рагу
• plural: овощные блюда

Here соус is masculine singular, so овощной is the correct agreeing form.

Yes. It is the direct object of сделала, so the whole phrase is in the accusative.

However, both words happen to look the same as in the nominative:

• соус is inanimate masculine singular, so nominative = accusative
• the adjective овощной matches that form

So although it is grammatically accusative, there is no visible change here.

Быстро is the adverb quickly. Adverbs modify verbs, so here it describes how she made the sauce.

Its position is fairly flexible in Russian. For example, all of these are possible:

• Сестра взяла блендер и быстро сделала овощной соус.
• Сестра быстро взяла блендер и сделала овощной соус.
• Сестра взяла блендер и сделала овощной соус быстро.

The most natural choice depends on what you want to emphasize. In your sentence, быстро is closely connected with сделала, so it most naturally means she made the sauce quickly.

Here и connects two actions done by the same subject:

• взяла блендер
• быстро сделала овощной соус

So the structure is basically:

Сестра [взяла блендер] и [быстро сделала овощной соус].

Russian often uses и exactly like English and to join two verbs or two clauses with the same subject.

Yes. Russian word order is more flexible than English because case endings carry much of the grammatical information.

For example, you could also say:

• Сестра быстро сделала овощной соус, взяв блендер.
• Блендер сестра взяла и быстро сделала овощной соус.
• Овощной соус сестра быстро сделала, взяв блендер.

But these alternatives change the emphasis or sound more literary, marked, or context-dependent.

The original sentence is neutral and natural: Сестра взяла блендер и быстро сделала овощной соус.

The main stresses are:

• сестра́
• взяла́
• бле́ндер
• бы́стро
• сде́лала
• овощно́й
• со́ус

A couple of these are especially worth remembering:

• взяла́ has stress on the last syllable
• овощно́й has stress on the last syllable

Stress in Russian is unpredictable, so it is best to learn it together with each word.

Yes, in many contexts it could.

• сделала соус = made sauce
• приготовила соус = prepared sauce

Both are possible, but they are not always identical in tone:

• сделала is very general and common
• приготовила sounds a bit more specifically like preparing food

So сестра ... быстро сделала овощной соус is natural, but приготовила would also be a very normal choice.