Η προειδοποίηση εμφανίζεται στην οθόνη.

• Η = the (feminine singular)
• προειδοποίηση = warning
• εμφανίζεται = appears / is displayed / shows up
• στην = on the / to the / in the, depending on context; here it means on the
• οθόνη = screen

So the structure is basically The warning appears on the screen.

Greek often uses the definite article more regularly than English does. In this sentence, Η προειδοποίηση means the warning, referring to a specific warning.

The article Η is used because προειδοποίηση is:

• feminine
• singular
• nominative (the subject of the sentence)

You usually learn the gender together with the noun, so it is best to memorize it as η προειδοποίηση.

In this sentence, the article tells you directly:

• η = feminine singular nominative

So even if the noun ending is not yet familiar to you, the article shows its gender.

It is in the nominative case because it is the subject of the sentence — the thing doing the action, or in this case, the thing that appears.

So:

• Η προειδοποίηση = the subject
• εμφανίζεται = the verb
• στην οθόνη = where it appears

The verb comes from εμφανίζομαι, which often means:

• to appear
• to show up
• to become visible
• in some contexts, to be displayed

So in a tech or interface context, Η προειδοποίηση εμφανίζεται στην οθόνη can naturally mean:

• The warning appears on the screen
• The warning is displayed on the screen

Greek often uses this verb where English might prefer either appears or is displayed, depending on style.

εμφανίζεται is a third-person singular verb form in the present tense. The ending -εται is typical of many verbs in the middle/passive-style set of endings in Modern Greek.

Here it matches the subject:

• Η προειδοποίηση = singular
• εμφανίζεται = it appears

So the sentence is literally structured as:

• The warning appears on the screen

Not exactly in the same way English uses the word passive. In Modern Greek, forms like εμφανίζεται belong to a set often called the mediopassive or middle/passive forms.

In actual meaning, though, it can function very naturally as:

• appears
• is shown
• is displayed

So grammatically it belongs to that middle/passive verb pattern, but in translation you should choose the most natural English wording for the context.

Because στην is a contraction.

It comes from:

• σε = on / in / at / to
• την = the (feminine accusative singular)

Together:

• σε την → στην

So:

• στην οθόνη = on the screen

This contraction is extremely common in Modern Greek.

After the preposition σε, Greek normally uses the accusative case.

That is why you get:

• στην οθόνη

Even though in English we just say on the screen, Greek marks that relationship with σε + accusative.

Some feminine nouns look the same in the nominative singular and accusative singular.

For οθόνη:

• nominative singular: η οθόνη
• accusative singular: την οθόνη

The noun itself does not change here; only the article changes:

• η → nominative
• την → accusative

After contraction with σε, την becomes part of στην.

Yes. Greek word order is more flexible than English word order, because case endings and articles help show the grammatical roles.

The neutral, straightforward order here is:

• Η προειδοποίηση εμφανίζεται στην οθόνη.

But other orders are possible for emphasis, for example:

• Στην οθόνη εμφανίζεται η προειδοποίηση.

That version puts more focus on on the screen.
Still, the original sentence is the most natural basic order for many contexts.

A simple pronunciation guide is:

ee pro-ee-tho-POI-ee-see em-fa-NEE-zeh-teh steen oth-ON-ee

A few helpful points:

• Η sounds like ee
• οι in προειδοποίηση sounds like ee
• θ sounds like the th in think
• ζ sounds like z
• στην sounds roughly like steen

The stressed syllables are marked by the accent:

• προειδοποίηση
• εμφανίζεται
• οθόνη

It is present tense.

So the sentence can mean:

• The warning appears on the screen
• The warning is appearing on the screen
• in a general or technical-description sense, The warning appears on the screen

In instructions, manuals, and software descriptions, Greek often uses the present tense this way.

Yes, very naturally. It sounds exactly like the kind of sentence you might see in:

• a software manual
• a troubleshooting guide
• a user interface description
• an instruction sheet

In that context, εμφανίζεται is especially well translated as:

• appears
• is displayed

So this is a very useful real-world sentence for learners.