Ćwiczenie poprawia mowę.

Because mowę is in the accusative case, which is the case used for a direct object.

• Dictionary form: mowa
• In this sentence: mowę

The verb poprawia means improves, and the thing being improved is speech, so mowa has to change form.

This is very common with feminine nouns ending in -a:

• mowa → mowę
• książka → książkę
• kawa → kawę

So in Ćwiczenie poprawia mowę, ćwiczenie is the subject and mowę is the object.

Here, ćwiczenie is a noun, not a verb.

It means something like:

• exercise
• practice
• training activity

It comes from the verb ćwiczyć (to practise / to exercise / to train), but in this sentence it is functioning as a regular noun.

So grammatically:

• Ćwiczenie = subject
• poprawia = verb
• mowę = object

It can suggest either, depending on context.

Polish ćwiczenie can refer to:

1. a single exercise
2. exercise/practice as an activity

In this sentence, without more context, it can sound a bit general, like:

• Exercise improves speech
• Practising improves speech

Polish often allows this kind of broad meaning without needing a different form the way English sometimes does.

Because poprawia is the conjugated present-tense form, while poprawić is the infinitive.

• poprawiać = imperfective infinitive, to improve
• poprawia = improves / is improving
• poprawić = perfective infinitive, to improve in the sense of completing the action

In a normal statement like this, Polish needs a finite verb, so poprawia is correct.

Also, the imperfective form is natural here because the sentence expresses a general truth or regular effect:

• Ćwiczenie poprawia mowę. = Exercise improves speech.

Because it agrees with ćwiczenie, which is:

• singular
• neuter
• third person

The verb form poprawia is the 3rd person singular present form.

You can compare:

• Ćwiczenie poprawia mowę. = The exercise improves speech.
• Ćwiczenia poprawiają mowę. = Exercises improve speech.

So the singular subject ćwiczenie requires singular poprawia.

A rough pronunciation guide is:

chvee-CHE-nye po-PRA-vya MO-ve

A few important points:

• ć sounds somewhat like a soft ch
• cz in ćwiczenie is not the English ch exactly; the whole word is quite soft-sounding
• w in Polish sounds like English v
• stress is usually on the second-to-last syllable

So the stress pattern is:

• ćwiCZEnie
• poPRAwia
• MOwę

This is a very common learner question.

The letter ę is a nasal vowel, but its pronunciation changes depending on position. At the end of a word, especially in normal speech, it is often pronounced less strongly nasally than learners expect.

So mowę is often pronounced approximately like:

• mov-eh
• or mov-en very lightly

Do not try to make it sound like a strong French-style nasal vowel. In everyday Polish, final ę is often fairly subtle.

No, Polish word order is flexible, because the case endings show what each word is doing.

The neutral, straightforward order is:

• Ćwiczenie poprawia mowę.

But other orders are possible, for example:

• Mowę poprawia ćwiczenie.

That still means essentially the same thing, but the emphasis changes. This version puts more focus on mowę.

So Polish uses word order more for emphasis and style than English does.

Because Polish does not have articles like English a/an/the.

So ćwiczenie can mean:

• an exercise
• the exercise
• exercise in general

And mowę can mean:

• speech
• the speech
• one’s speech

The exact meaning depends on context, not on an article.

Usually mowa means speech or the ability to speak, not language in the sense of Polish, English, French, etc.

In this sentence, mowę most naturally means:

• speech
• speaking ability
• possibly pronunciation / articulation, depending on context

This is a very natural kind of phrase in contexts like:

• speech therapy
• pronunciation practice
• language development

If you wanted to say language as a system, you would more often use język.

It can be understood either way, but without context it often sounds general.

So it could mean:

• Exercise improves speech.
• Practising improves speech.

If the speaker wanted to make it clearly specific, the wider context would normally do that. Since Polish has no articles, the sentence itself does not force one interpretation.

Grammatically, yes, pretty closely:

• Ćwiczenie = exercise
• poprawia = improves
• mowę = speech

So the word-for-word structure is basically:

Exercise improves speech.

But depending on context, a more natural English translation might also be:

• Practising improves speech.
• Exercise helps improve speech.

So the Polish structure is simple, but English may choose slightly different wording depending on what kind of ćwiczenie is meant.