Profesor używa aplikacji.

Because the verb używać normally takes the genitive case in Polish.

• dictionary form: aplikacja
• genitive singular: aplikacji

So:

• Profesor używa aplikacji. = The professor is using / uses an application.

This is something English speakers often have to get used to, because in English use takes a direct object with no case change, but in Polish the noun changes form.

A useful comparison:

• Profesor ma aplikację. = The professor has an application.
  Here mieć takes the accusative, so you get aplikację.

But:

• Profesor używa aplikacji.
  Here używać takes the genitive, so you get aplikacji.

Używa is the 3rd person singular present tense form of używać.

It can mean:

• uses
• is using

Polish present tense can cover both simple present and present continuous meanings, depending on context.

Examples:

• Profesor używa aplikacji codziennie. = The professor uses the app every day.
• Profesor teraz używa aplikacji. = The professor is using the app now.

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

So Profesor używa aplikacji could mean:

• The professor uses an application
• A professor uses the application
• The professor is using the app

The exact meaning depends on context.

English speakers often want a one-to-one equivalent for the or a, but Polish simply does not mark that distinction in the same way.

Usually, yes: profesor refers to a university professor or someone with that academic title.

It is not the normal everyday word for a school teacher. For teacher, Polish usually uses nauczyciel.

So:

• profesor = professor
• nauczyciel = teacher

Depending on context, profesor can also be used as a formal title when addressing someone.

Because Polish often omits subject pronouns when they are clear from the verb form or context.

In Profesor używa aplikacji, the subject is already stated: Profesor.

Even without it, Używa aplikacji could mean He/she is using an application, depending on context, because the verb form shows 3rd person singular.

Polish uses pronouns like on, ona, oni mainly when needed for emphasis, contrast, or clarity.

Yes. Polish word order is more flexible than English word order because case endings help show grammatical roles.

The neutral order here is:

• Profesor używa aplikacji.

But you could also see:

• Aplikacji używa profesor.
• Używa aplikacji profesor.

These versions are possible, but they change the focus or emphasis.

For example:

• Profesor używa aplikacji. = neutral statement
• Aplikacji używa profesor. = emphasis on the application
• Używa aplikacji profesor. = more marked, context-dependent

So the words can move, but not always with exactly the same feel.

Profesor is in the nominative singular because it is the subject of the sentence.

The basic dictionary form is also profesor.

So in this sentence:

• Profesor = subject, nominative
• aplikacji = object after używać, genitive

This is a very common pattern in Polish sentences:

• subject in nominative
• object in another case, depending on the verb

Używać is imperfective.

That means it is used for:

• ongoing actions
• repeated actions
• general habits

So Profesor używa aplikacji can mean:

• The professor uses an application
• The professor is using an application

The related perfective verb is usually użyć.

Compare:

• Profesor używa aplikacji. = ongoing/habitual
• Profesor użył aplikacji. = the professor used the application/app once, completed action

English speakers often need time to get used to aspect, because it is a major part of Polish verbs.

A rough pronunciation guide:

• używa ≈ oo-ZHI-va
• aplikacji ≈ a-plee-KA-tsyee

A few helpful points:

• u sounds like oo
• ż sounds like the zh in measure
• y is a Polish vowel that does not exist exactly in English; it is somewhat like a short, central i
• cj in aplikacji gives a tsy-like sound at the end

Also:

• Profesor is pronounced roughly pro-FE-sor

Most often in modern everyday Polish, aplikacja means an application/app, especially in a digital or software sense.

So aplikacji here will usually be understood as:

• an app
• an application

In some contexts, related words can have broader meanings, but for a learner, treating aplikacja as app/application is the safest starting point.

Yes. Korzystać z is another very common way to say to use in Polish.

So you can say:

• Profesor używa aplikacji.
• Profesor korzysta z aplikacji.

Both can mean The professor uses the application/app, but there is a slight difference in feel:

• używać = to use, often more direct
• korzystać z = to make use of / to use, often very natural for services, tools, apps, transport, etc.

Grammar note:

• korzystać z requires z + genitive
• that is why you also get aplikacji after z

So:

• korzysta z aplikacji = literally makes use of the app/application

In this sentence, it is most naturally understood as genitive singular: of an application / app.

That is because:

• the base noun is aplikacja
• genitive singular is aplikacji

However, some Polish noun forms can look the same across different cases or numbers, so learners are right to notice ambiguity. In this sentence, though, the normal reading is singular.

If you wanted a clearly plural meaning, context would usually make it obvious:

• Profesor używa różnych aplikacji. = The professor uses various applications/apps.

Here aplikacji is clearly plural because of różnych and the meaning of the whole sentence.