Możesz mówić poprawnie, a mimo to napisać coś błędnie.

Because they depend on możesz (you can / you may / it is possible for you to).

In Polish, after a modal verb like móc (to be able to, can), the next verb is usually in the infinitive:

• możesz mówić = you can speak
• możesz napisać = you can write / you may write

So the structure is:

• możesz
  • infinitive
• you can
  • base verb

That is very normal in Polish.

This is about aspect, which is very important in Polish.

• mówić is imperfective
• napisać is perfective

Here, that choice makes good sense:

• mówić poprawnie focuses on speaking as a general ability or ongoing activity: to speak correctly
• napisać coś błędnie focuses on producing one completed written result incorrectly: to write something incorrectly

So the sentence suggests:

• you may generally speak correctly,
• and yet still end up writing some particular thing wrongly.

If you used pisać instead, it would sound more like the process or habit of writing, not one completed result.

Compare:

• Możesz mówić poprawnie, a mimo to pisać błędnie.
  = You may speak correctly and still write incorrectly.
  (more general habit)

• Możesz mówić poprawnie, a mimo to napisać coś błędnie.
  = You may speak correctly and still write something incorrectly.
  (one result / one instance)

A mimo to means and yet, but even so, or nevertheless.

It connects two ideas that contrast with each other:

• Możesz mówić poprawnie = You can speak correctly
• a mimo to napisać coś błędnie = and yet still write something incorrectly

So it introduces a surprising second fact.

A few similar expressions are:

• jednak = however / still / nevertheless
• mimo to = despite that / nevertheless
• ale mimo to = but even so

In this sentence, a mimo to sounds very natural and smooth.

Here a is a coordinating conjunction linking two clauses. It often translates as and, but in many contexts it has a contrastive sense closer to while, whereas, or and yet.

In this sentence, a helps set up the contrast, and mimo to strengthens it:

• a = links the two parts
• mimo to = signals despite that / even so

Together, a mimo to gives a strong sense of contrast.

They are adverbs.

• poprawnie comes from poprawny = correct
• błędnie comes from błędny = incorrect / erroneous

Because they are adverbs, they modify verbs:

• mówić poprawnie = to speak correctly
• napisać błędnie = to write incorrectly

This is similar to English correct → correctly, though in Polish the form is different.

A learner might expect an adjective somewhere, but here the sentence is describing how someone speaks and writes, so adverbs are needed.

Because błędnie describes how the writing is done, not what kind of thing coś is.

In:

• napisać coś błędnie

the structure is:

• coś = something (the object)
• błędnie = incorrectly (an adverb modifying napisać)

So the meaning is:

• to write something incorrectly

If you said:

• napisać coś błędnego

then błędnego would be an adjective agreeing with coś, and the meaning would be more like:

• to write something erroneous
• to write something that is wrong

That is possible, but it is a different structure and a slightly different emphasis.

So:

• coś błędnie = write something in an incorrect way
• coś błędnego = write something that is itself wrong

Because Polish often omits repeated words when they are understood from the first part of the sentence.

So:

• Możesz mówić poprawnie, a mimo to napisać coś błędnie.

really means:

• Możesz mówić poprawnie, a mimo to możesz napisać coś błędnie.

But repeating możesz would usually sound unnecessary here.

This is very common in Polish and English alike:

• You can speak correctly and still write something incorrectly.

English also does not need to repeat can.

Here możesz is best understood as can in the sense of it is possible for you to.

It does not mainly express permission here.

So the sentence is about possibility:

• it is possible that someone speaks correctly,
• and yet still writes something incorrectly.

In other contexts, możesz can also mean you may:

• Możesz wejść. = You may come in.

But in this sentence, the meaning is clearly about possibility, not permission.

Because Polish normally uses a comma before a coordinating conjunction like a when it links two clauses.

Here the sentence has two coordinated parts:

• Możesz mówić poprawnie
• a mimo to napisać coś błędnie

The comma helps mark the contrast and the clause boundary.

This is standard Polish punctuation.

Yes, Polish word order is flexible, but different orders sound more or less natural and may shift emphasis.

The original sentence is very natural:

• Możesz mówić poprawnie, a mimo to napisać coś błędnie.

You could also hear things like:

• Możesz poprawnie mówić, a mimo to coś napisać błędnie.
• Możesz mówić poprawnie, a mimo to błędnie coś napisać.

These are grammatically possible, but they may sound less neutral or may emphasize different parts.

For learners, the original version is the safest and most natural model.

Not exactly.

• mówić poprawnie = to speak correctly, grammatically, properly
• mówić dobrze = to speak well

Dobrze is broader. It can mean fluently, effectively, or skillfully.
Poprawnie focuses more on correctness.

So in this sentence, poprawnie is a very good choice because the contrast is with błędnie (incorrectly).

In mimo to, to refers back to the previous idea, something like despite that or even so.

So:

• mimo = despite
• mimo to = despite that / even so / nevertheless

It works as a fixed expression in modern Polish, so it is best to learn mimo to as one unit.

Yes, that is the idea behind the sentence.

It implies that:

• someone may be good at speaking correctly,
• but that does not guarantee error-free writing.

This is a very natural point in language learning, and the Polish sentence expresses it neatly through contrast:

• poprawnie in speech
• błędnie in writing

So grammatically and semantically, the sentence highlights the difference between oral and written accuracy.