Αν τύχει να χύσω τον χυμό από μανταρίνι στον πάγκο, τον σκουπίζω αμέσως.

It means if it happens that or, more naturally in English, if I happen to.

So the beginning of the sentence is not just a plain if. It adds the idea that this is something accidental or occasional:

Αν τύχει να χύσω... = If I happen to spill...

Also, τύχει comes from τυχαίνω and is being used impersonally here, as if Greek were saying if it happens that I spill...

Because αν introduces the conditional clause by itself. In Modern Greek, after αν, you normally use the verb form directly, not αν να...

So:

• αν τύχει = correct
• αν να τύχει = not correct

The later να is there for a different reason: τύχει is followed by another verb phrase, να χύσω, meaning to spill / that I spill.

So the structure is:

Αν τύχει + να χύσω...
= If it happens + that I spill...

Because χύσω is the aorist subjunctive form of χύνω, and here Greek wants the idea of one complete act of spilling.

That is the normal choice when talking about a single possible event:

να χύσω = to spill once / to end up spilling

If you used the imperfective form να χύνω, it would suggest something more ongoing, repeated, or habitual, which does not fit as well here.

So:

• να χύσω = a single spill
• να χύνω = spilling in an ongoing or repeated way

Because after αν, Greek commonly uses the aorist subjunctive form for a possible future event.

Here, τύχει is the aorist subjunctive of τυχαίνω and means something like should happen or happen to.

So:

• αν τύχει = if it happens / if it should happen
• not a statement of fact, but a possibility

This is very common in Greek for open conditions.

Because the sentence describes a usual reaction or general habit.

The meaning is basically:

Whenever that happens, I wipe it up immediately.

Greek often uses the present tense in the main clause when talking about what someone normally does in that situation.

So:

• τον σκουπίζω αμέσως = I wipe it immediately as a regular response

If you wanted to talk about one specific future occasion, Greek would more likely say:

...θα τον σκουπίσω αμέσως
= ...I’ll wipe it immediately

This is a good question, because it is actually a bit ambiguous.

Grammatically, τον could refer to:

• τον χυμό = the juice
• τον πάγκο = the counter

Both nouns are masculine singular, so both can become τον.

In context, many learners will understand it as I wipe it up immediately, referring to the spilled juice. But a native speaker could also hear it as I wipe the counter immediately.

If you want to make it clearer, Greek can repeat the noun or add something extra, for example:

τον σκουπίζω αμέσως από τον πάγκο
to make it clearer that it is the juice being wiped up

or

τον πάγκο τον σκουπίζω αμέσως
to make it clearer that it is the counter being wiped

Because in Modern Greek, unstressed object pronouns usually come before a finite verb.

So:

• τον σκουπίζω = I wipe it
• τον βλέπω = I see him/it
• το κάνω = I do it

This is the normal word order for clitic object pronouns.

One very common exception is the positive imperative, where the pronoun usually comes after:

• σκούπισέ τον = wipe it

στον is a contraction of σε + τον.

So:

• σε τον πάγκο becomes στον πάγκο

Because πάγκος is masculine singular, you get στον.

Here στον πάγκο means on the counter or onto the counter. In everyday Greek, σε often covers meanings that English splits into in, on, to, and onto, depending on context.

Yes, Greek can express this idea in more than one way.

χυμό από μανταρίνι means juice made from mandarin. The singular μανταρίνι is being used generically, meaning the fruit type.

You can also hear:

χυμό μανταρινιού

That is also very natural and may even sound more idiomatic to many speakers.

So both are possible:

• χυμό από μανταρίνι
• χυμό μανταρινιού

They both mean mandarin juice.

Greek uses the definite article more often than English does.

Here τον χυμό refers to the specific juice involved in the situation, so the article sounds natural.

If you said:

Αν τύχει να χύσω χυμό...

that would sound more like If I happen to spill some juice...

So the difference is roughly:

• τον χυμό = the juice, more specific
• χυμό = juice / some juice, less specific