Rój jest tutaj.

It is a very simple Polish sentence:

• rój = the subject noun
• jest = the verb, is
• tutaj = the adverb, here

So the structure is:

subject + verb + adverb

This is a normal, straightforward sentence pattern in Polish.

Because rój is the subject of the sentence, and subjects are normally in the nominative in Polish.

Here, tutaj is just an adverb of place, so it does not change the case of the noun. Nothing in this sentence requires a different case, so rój stays in the nominative singular.

Jest is the 3rd person singular present tense form of the verb być (to be).

Because rój is grammatically singular, Polish uses the singular verb form:

• jest = is

If the subject were plural, the verb would change accordingly.

In standard Polish, yes, it is necessary here.

Rój tutaj would usually sound incomplete, like a note, a headline, or a very compressed phrase rather than a normal full sentence.

So if you want a standard sentence, use:

Rój jest tutaj.

Yes. Polish word order is more flexible than English word order.

You can say:

• Rój jest tutaj.
• Tutaj jest rój.
• Jest tutaj rój.

These all express roughly the same basic idea, but the emphasis changes:

• Rój jest tutaj: neutral, focuses on the swarm
• Tutaj jest rój: emphasizes here
• Jest tutaj rój: can sound a bit more like there is a swarm here

So the sentence is flexible, but the most neutral version is the one you were given.

Both mean here.

In many situations, they are interchangeable:

• Rój jest tutaj.
• Rój jest tu.

Very broadly:

• tu is shorter and very common in everyday speech
• tutaj can sound a bit fuller or slightly more emphatic

But in most beginner situations, you can think of them as near-equivalents.

A rough English approximation is rooy, with:

• r rolled or tapped in Polish
• ó pronounced like Polish u
• j pronounced like English y in yes

So rój sounds approximately like rooy.

The exact Polish pronunciation is more compact than the English-style approximation, but that is a good starting point.

In modern Polish, ó and u are pronounced the same way.

So in speech, there is no difference in sound. The spelling difference is historical and must simply be learned word by word.

This is very common in Polish. For a learner, the important thing is:

• ó and u sound the same
• but they are spelled differently depending on the word

So rój is pronounced with a u sound, even though it is written with ó.

Grammatically, rój is singular.

It is a collective noun: one swarm contains many individual insects, but the noun itself is singular.

That is why the verb is singular too:

• rój jest ... not rój są

This is similar to English words like a group or a crowd: many members, but one grammatical unit.

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

So rój can mean:

• a swarm
• the swarm

Which one is intended depends on context.

This is a very common adjustment for English speakers learning Polish: you usually do not translate a or the directly, because Polish normally leaves that information unstated unless the context makes it clear.

Rój is a masculine noun, specifically masculine inanimate.

Yes, that matters, because adjectives, pronouns, and some other words must agree with it.

For example:

• ten rój = this swarm
• duży rój = a big swarm

So even in a short sentence like Rój jest tutaj, the noun already has grammatical properties you will need in longer sentences later.