Nie lubię, kiedy on tak robi.

Because lubię is the conjugated form, meaning I like.

• lubić = the infinitive, to like
• lubię = I like

Adding nie makes it negative:

• lubię = I like
• nie lubię = I don’t like

So Nie lubię is the normal way to say I don’t like.

Polish usually does not need a separate word for that it.

In this sentence, the whole clause kiedy on tak robi functions as the thing you don’t like. So Polish simply says:

• Nie lubię, kiedy on tak robi

Literally, that is closer to I don’t like when he does that, but the natural English translation is often I don’t like it when he does that.

Here kiedy introduces a subordinate clause and means when or whenever.

So:

• kiedy on tak robi = when he does that / whenever he does that

In this kind of sentence, it often has a general or repeated sense, not just one single moment.

Yes. Very often, yes.

Polish frequently omits subject pronouns when the subject is clear from context. So this is also very natural:

• Nie lubię, kiedy tak robi.

Including on can:

• add emphasis
• create contrast, as in he does that
• make the subject clearer if several people are being discussed

So both versions are possible, but the version without on is often more natural in everyday speech.

Here tak means like that, that way, or so.

So:

• tak robi = does it like that / acts like that / behaves that way

In English, the most natural translation may be when he does that or when he acts like that, depending on context.

Because robi is the correct finite verb form for he does.

• robić = to do, to make
• robi = he/she/it does, is doing

So:

• on robi = he does / he is doing

You need a conjugated verb in the clause, not the infinitive.

Because robi comes from the imperfective verb robić, which fits a general, repeated action.

• robi suggests something habitual or ongoing: when he does that / when he acts like that
• zrobi is perfective and usually points to one completed action, often with a future sense in the present form

So Nie lubię, kiedy on tak robi sounds like a general complaint about his behavior.

If you wanted a one-time past event, Polish would usually use something like:

• Nie podobało mi się, kiedy tak zrobił.

That means something more like I didn’t like it when he did that on a particular occasion.

Usually it suggests a repeated or typical behavior.

That is because:

• robi is imperfective
• kiedy in this kind of sentence often means whenever
• the whole sentence sounds like a general opinion

So the sense is usually:

• I don’t like it when he does that
• I don’t like it when he behaves like that

not necessarily one single event.

Because Polish normally uses a comma before a subordinate clause introduced by words like:

• kiedy = when
• gdy = when
• że = that
• bo = because

So the comma in Nie lubię, kiedy on tak robi is standard and required.

Yes. Nie lubię, gdy on tak robi is also correct and natural.

Very roughly:

• kiedy = very common, neutral
• gdy = also common, sometimes a bit more formal or literary

For a learner, both are good, but kiedy is an especially safe everyday choice.

Not completely, but some versions sound more natural than others.

The most natural forms are:

• Nie lubię, kiedy on tak robi.
• Nie lubię, kiedy tak robi.

Polish word order is flexible, but changing it can change emphasis. For example, keeping tak right before robi is the most natural arrangement here.

So yes, the order can vary, but the original sentence is a very normal one.

It can be understood either way depending on context, but in this sentence it often feels like to act / behave.

So kiedy on tak robi can mean:

• when he does that
• when he acts like that
• when he behaves that way

If the context is about a specific action, then does that is best. If it is about manners or attitude, acts like that may sound more natural in English.