W tym słowie trzeba wymawiać każdą sylabę wyraźnie, a akcent pada na drugą.

Because w meaning in or within usually takes the locative case when it describes location.

• dictionary form: słowo
• after w: w słowie
• with ten: w tym słowie

So w tym słowie means in this word.

Ten changes form to match the noun’s gender, number, and case.

Here, słowo is:

• neuter
• singular
• locative after w

So ten becomes tym.

A few forms for comparison:

• ten wyraz — this word
• to słowo — this word
• w tym słowie — in this word

Trzeba is an impersonal word meaning something like:

• it is necessary
• one must
• you have to

So trzeba wymawiać means it is necessary to pronounce or you have to pronounce.

There is no personal subject like ja, ty, or my. It is a very common Polish way to give general instructions.

Because wymawiać is imperfective, and that fits a general instruction about how something should be pronounced.

• wymawiać = to pronounce, as a process / habit / repeated action
• wymówić = to pronounce successfully / completely, once

In this sentence, the speaker is not talking about one completed act. They are explaining how the word should be pronounced in general, so wymawiać is the natural choice.

Because każdą sylabę is the direct object of wymawiać, so it goes in the accusative case.

The noun sylaba is feminine singular, so:

• nominative: każda sylaba
• accusative: każdą sylabę

Both words change:

• każda → każdą
• sylaba → sylabę

Wyraźnie is an adverb, meaning clearly or distinctly.

It modifies wymawiać, so the idea is to pronounce each syllable clearly.

This is the adjective/adverb pair:

• wyraźny = clear, distinct
• wyraźnie = clearly, distinctly

In Polish, a comma is normally written before conjunctions like a, ale, że, bo, and several others.

Here a joins two clauses:

• trzeba wymawiać każdą sylabę wyraźnie
• akcent pada na drugą

So the comma is standard Polish punctuation.

Both can sometimes be translated as and, but they are not used in exactly the same way.

• i simply adds information
• a often introduces a new but related point, sometimes with a slight contrast or shift of focus

Here, a sounds natural because the second clause changes the topic slightly:

• first: how to pronounce the syllables
• second: where the stress goes

So a is a bit like and as for... or and meanwhile... rather than a plain and.

Yes, it is fairly literal. Polish often says that stress falls on a syllable:

• akcent pada na... = the stress falls on...

This is the normal idiomatic way to describe word stress in Polish.

So akcent pada na drugą is the standard way to say that the stress is on the second syllable.

Because after pada na, Polish uses the accusative:

• na drugą [sylabę]

The implied noun is sylabę, which is feminine singular accusative, so druga becomes drugą.

Compare:

• na drugą sylabę — onto the second syllable / on the second syllable for stress placement
• o drugiej — about the second one / at the second hour, depending on context

So drugą is required here.

Because Polish often leaves out a noun when it is obvious from context.

Earlier in the sentence, we already had każdą sylabę, so in the second clause drugą clearly means drugą sylabę.

This is very natural in Polish and in English too:

• Polish: akcent pada na drugą
• English: the stress falls on the second one

By itself, na drugą normally means the second syllable, usually understood from the beginning.

If Polish wants to say the second from the end, it will usually say that explicitly, for example:

• na przedostatnią sylabę = on the penultimate syllable
• na drugą sylabę od końca = on the second syllable from the end

So in this sentence, unless more context says otherwise, na drugą means on the second syllable.

The word order is quite natural and information-focused.

• W tym słowie sets the context: in this word
• trzeba wymawiać każdą sylabę wyraźnie gives the instruction
• a akcent pada na drugą adds the stress information

A more literal English-style order might be:

• Trzeba w tym słowie wyraźnie wymawiać każdą sylabę...

But Polish word order is flexible, and the original version sounds smooth and normal. Putting W tym słowie first helps frame the sentence immediately.