Mogę pomylić ten czasownik z innym, bo brzmią prawie tak samo.

Mogę is the 1st person singular form of móc (to be able to / can).

In this sentence, it most naturally expresses possibility:

• Mogę pomylić... = I may / might confuse...
• or more literally, I can confuse...

English often prefers might here, because the idea is not permission, but the possibility of making a mistake.

So although mogę often translates as can, in context it can sound closer to might.

This is about aspect.

• pomylić = perfective
• mylić = imperfective

Here, pomylić suggests one complete act of confusing one thing with another.

So:

• Mogę pomylić ten czasownik z innym = I might confuse this verb with another one
  (a single possible mistake)

If you used mylić, it would sound more like:

• a repeated habit,
• an ongoing tendency,
• or confusion in general.

So the perfective pomylić fits well when talking about one possible mistake.

They are related, but not used in exactly the same way.

• pomylić coś z czymś = to mistake one thing for another
• pomylić się = to make a mistake / to be mistaken

In your sentence:

• Mogę pomylić ten czasownik z innym
  = I might mistake this verb for another one

If you said:

• Mogę się pomylić
  = I might be mistaken / I might make a mistake

So się changes the structure and the meaning slightly. Here, because the sentence names what is being confused, the version without się is the right one.

Ten czasownik is the direct object of pomylić, so it is in the accusative case.

But for a masculine inanimate singular noun, the accusative looks the same as the nominative.

So:

• nominative: ten czasownik
• accusative: ten czasownik

That is why nothing changes on the surface.

If it were a masculine animate noun, you would see a clearer difference.

After pomylić coś z czymś (to confuse one thing with another), Polish uses z + instrumental.

So:

• ten czasownik = the thing being confused
• z innym = with another one

Innym is the instrumental singular form of inny (other / another).

The full form could be:

• z innym czasownikiem

But Polish often omits the noun when it is obvious from context, so z innym is enough here.

Because Polish often leaves out repeated words when the meaning is clear.

So instead of saying:

• Mogę pomylić ten czasownik z innym czasownikiem

you can simply say:

• Mogę pomylić ten czasownik z innym

The missing noun is understood from the earlier word czasownik.

In English we do this too:

• I might confuse this verb with another
  instead of
• I might confuse this verb with another verb

Because the subject of brzmią is really two things:

• ten czasownik
• inny (czasownik)

Even though the second noun is omitted, it is still understood. So the meaning is:

• this verb and the other one sound almost the same

That is why Polish uses the 3rd person plural:

• brzmią = they sound

If there were only one subject, you would use brzmi.

Tak samo means the same way or the same.

In this sentence:

• brzmią prawie tak samo = they sound almost the same

It is a very common Polish expression.

Compare:

• tak samo wyglądają = they look the same
• tak samo mówię = I say it the same way

Here, tak samo is stronger than just podobnie (similarly), because it suggests very close similarity.

Prawie means almost.

So:

• brzmią tak samo = they sound the same
• brzmią prawie tak samo = they sound almost the same

Using prawie makes the sentence more precise. It suggests that the two verbs are very similar in sound, but not completely identical.

Yes.

• bo = because in everyday, neutral speech
• ponieważ = because / since, usually a bit more formal

So both are possible:

• Mogę pomylić ten czasownik z innym, bo brzmią prawie tak samo.
• Mogę pomylić ten czasownik z innym, ponieważ brzmią prawie tak samo.

The version with bo sounds more natural in normal conversation.

Not completely. Polish word order is fairly flexible, but the original sentence is very natural.

The basic structure is:

• Mogę pomylić ten czasownik z innym
• bo brzmią prawie tak samo

You can move things around for emphasis, but not every version sounds equally natural.

For example, the original sentence flows well because it presents:

1. the possible mistake,
2. then the reason for it.

That is the most straightforward and idiomatic order.

Yes. Ten czasownik makes the sentence specific.

It tells you exactly what might be confused: this verb.

If you removed it, you would need some other object:

• Mogę to pomylić z innym = I might confuse it with another one

That would be grammatically possible, but less clear unless the context already makes it obvious what to refers to.

So ten czasownik is there to keep the sentence precise and natural.