Цыплёнок ел зерно так быстро, что дочка начала смеяться.

Цыплёнок means chick or baby chicken, while курица usually means hen/chicken. So the sentence specifically talks about a small chicken, not an adult one.

Also, цыплёнок is a masculine noun, which is why the verb is ел and not ела.

Ел is the masculine singular past tense form of есть (to eat).

It matches цыплёнок, which is:

• masculine
• singular

In Russian past tense, the verb agrees with the subject in gender and number:

• он ел = he was eating / ate
• она ела = she was eating / ate
• оно ело = it was eating / ate
• они ели = they were eating / ate

So цыплёнок ел = the chick was eating / ate.

It is in the accusative case, but for this noun the accusative looks the same as the nominative.

Зерно is:

• neuter
• singular
• inanimate

For many neuter inanimate nouns, nominative = accusative:

• зерно (nominative)
• вижу зерно (accusative)

So in the sentence, ел зерно is correct accusative usage, even though the form does not visibly change.

Because the sentence needs an adverb, not an adjective.

• быстрый = fast (adjective, used with nouns)
• быстро = quickly / fast (adverb, used with verbs)

Here, быстро describes how the chick was eating, so an adverb is required:

• быстрый цыплёнок = a fast chick
• цыплёнок ел быстро = the chick ate quickly

This is a very common Russian structure meaning so ... that ...

• так быстро = so quickly
• что = that

So:

• так быстро, что дочка начала смеяться
  = so quickly that the daughter started laughing

You can use this pattern with many adjectives and adverbs:

• так громко, что... = so loudly that...
• так смешно, что... = so funny that...
• так устал, что... = so tired that...

Because что introduces a subordinate clause.

Russian punctuation regularly puts a comma before conjunctions like что, когда, если, etc. when they introduce another clause.

So the sentence has two parts:

1. Цыплёнок ел зерно так быстро
2. что дочка начала смеяться

The comma separates the main clause from the subordinate result clause.

Both mean daughter, but they have different tones.

• дочь = neutral, standard
• дочка = more affectionate, everyday, or informal

So дочка sounds a little warmer or more natural in many contexts, especially in storytelling or casual speech.

The sentence could also be ...что дочь начала смеяться, but that would feel a bit more neutral or formal.

Because начала смеяться means started to laugh / began laughing, which focuses on the beginning of the action.

• начала смеяться = started laughing
• смеялась = was laughing / laughed

The sentence is showing the result of what happened: the chick ate so quickly that the daughter began to laugh. That sense of sudden reaction is why начала смеяться works well here.

Because начать (to begin/start) is followed by an infinitive.

So the pattern is:

• начал читать = started reading
• начала говорить = started speaking
• начали работать = started working

Here:

• начала смеяться = started to laugh

This is very normal Russian grammar: a conjugated verb like начать + infinitive.

Yes. In the past tense, Russian verbs agree with the subject in gender and number.

Since дочка is:

• feminine
• singular

the verb is начала.

Compare:

• дочка начала смеяться = the daughter started laughing
• сын начал смеяться = the son started laughing
• дети начали смеяться = the children started laughing

It can often be translated either way depending on context, but here it most naturally suggests an ongoing action: was eating.

That is because есть in the past tense here is imperfective:

• it describes the process
• it does not emphasize completion

So the sentence paints a scene:

• the chick was eating grain so quickly
• that the daughter started laughing

If the speaker wanted to emphasize finishing the action, a perfective verb would be more likely, but that would create a different nuance.

Because съел would mean ate up / finished eating, which focuses on completion.

Here the sentence emphasizes the manner of eating—the chick was eating so quickly—rather than the fact that the grain was finished.

So:

• ел зерно = was eating grain / ate grain
• съел зерно = ate up the grain

Using ел makes the scene feel more continuous and descriptive.

A learner might wonder about pronunciation, because Russian stress matters a lot.

Key stresses here are:

• цыплёнок → цыплёнок
• зерно → зерно́
• быстро → бы́стро
• дочка → до́чка
• начала → начала́
• смеяться → смея́ться

A very important point: ё is always stressed. So in цыплёнок, the stress must fall on лё.

Yes, Russian word order is more flexible than English word order, but the neutral order here is very natural.

The original sentence:

• Цыплёнок ел зерно так быстро, что дочка начала смеяться.

You could rearrange parts for emphasis, for example:

• Так быстро цыплёнок ел зерно, что дочка начала смеяться.

That version is more emphatic or literary. The original sounds more neutral and straightforward.

So yes, the word order can change, but it changes the focus or style, not the basic meaning.

Because Russian has no articles.

English says:

• the chick
• a daughter
• the grain

Russian simply says:

• цыплёнок
• дочка
• зерно

Whether something is a or the is understood from context. This is very normal in Russian and one of the big differences from English.