Okoliczności są trudne.

Okoliczności means circumstances. In this sentence it is plural.

The singular form is okoliczność, meaning circumstance.
So:

• okoliczność = circumstance
• okoliczności = circumstances

In practice, Polish often uses the plural here in much the same way English does.

Because okoliczności is plural.

In Polish, the verb być (to be) changes depending on number:

• jest = is
• są = are

So:

• Okoliczność jest trudna. = The circumstance is difficult.
• Okoliczności są trudne. = The circumstances are difficult.

The adjective must agree with the noun in number and gender.

Here, okoliczności is a plural noun and it is not masculine personal, so the adjective takes the non-masculine-personal plural form:

• trudny = difficult (masculine singular)
• trudna = difficult (feminine singular)
• trudne = difficult (neuter singular or non-masculine-personal plural)
• trudni = difficult (masculine-personal plural)

Since okoliczności is plural and not a group of men, trudne is the correct form.

The singular noun okoliczność is feminine.

You can see that in the singular:

• Ta okoliczność jest trudna. = This circumstance is difficult.

But in the plural, Polish does not simply use the singular feminine adjective form. Instead, it uses the plural agreement pattern, and for this noun that gives trudne.

In this sentence, it is nominative plural, because it is the subject of the sentence.

That matters because okoliczności can also appear in other grammatical roles in other contexts. For example, Polish forms can sometimes look the same across different cases. But here, since the sentence means the circumstances are difficult, the noun is the subject, so nominative plural is the right analysis.

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

The neutral, straightforward version is:

• Okoliczności są trudne.

But you could also say:

• Trudne są okoliczności.

That sounds more marked or literary, with extra focus on trudne. In normal everyday use, Okoliczności są trudne is the most natural order.

No. Polish does not have articles like a or the.

So Okoliczności są trudne can mean:

• The circumstances are difficult
• Circumstances are difficult

In real usage, context tells you which sense is intended. Very often, English translations use the because that sounds most natural.

A rough English-friendly guide is:

• okoliczności ≈ oh-koh-leech-NOSH-chee
• są ≈ something like sow with a nasal vowel at the end
• trudne ≈ TROOD-neh

A few useful pronunciation notes:

• cz sounds like ch in chop
• ś/si before a vowel can sound like a soft sh
• ą is a nasal vowel; at the end of a word it often sounds somewhat like om/on, depending on context

A more accurate pronunciation of okoliczności includes a soft ś sound near the end that English does not have exactly.

Yes, sometimes, but difficult is usually the safer translation here.

• trudny can mean difficult, hard, or tough, depending on context.

With okoliczności, English most naturally says:

• The circumstances are difficult
• The circumstances are hard
• The circumstances are tough

All are possible, but difficult or tough often sounds best.

Yes, but it is a bit more formal or abstract than some other words.

Okoliczności is a normal and correct word, especially when talking about a situation, background factors, or conditions affecting something.

Depending on context, a speaker might also use words like:

• sytuacja = situation
• warunki = conditions

But okoliczności są trudne is perfectly natural Polish.

Because to is not needed here.

In Polish, when you say that something is an adjective, you normally just use the correct form of być plus the adjective:

• Okoliczności są trudne. = The circumstances are difficult.

You do not say:

• Okoliczności to są trudne. for this basic meaning

Polish does use to in other sentence patterns, especially when identifying one noun with another, such as:

• To jest problem. = This is a problem.
• Warszawa to stolica Polski. = Warsaw is the capital of Poland.

But with a simple adjective like trudne, plain są is enough.

The singular version would be:

• Okoliczność jest trudna.

That means The circumstance is difficult.

Notice the changes:

• okoliczności → okoliczność
• są → jest
• trudne → trudna

This is a good example of how Polish changes the noun, verb, and adjective so they all agree.