Το σπρέι διώχνει τα κουνούπια.

A word-by-word breakdown is:

• Το = the
• σπρέι = spray
• διώχνει = drives away / keeps away / chases away
• τα = the
• κουνούπια = mosquitoes

So the sentence literally works like: The spray drives away the mosquitoes.

These are definite articles:

• το = the for a singular neuter noun
• τα = the for a plural neuter noun

So:

• το σπρέι = the spray
• τα κουνούπια = the mosquitoes

Greek articles change depending on gender, number, and case, so you cannot use just one form of the for everything like in English.

σπρέι is a loanword from English, and in Greek many imported words of this type are treated as neuter.

So you normally say:

• το σπρέι = the spray

It is also commonly treated as indeclinable, meaning its form usually does not change across cases. The article shows the grammar:

• το σπρέι
• του σπρέι
• τα σπρέι (plural, if needed)

διώχνει is the 3rd person singular present tense of the verb διώχνω.

That means it corresponds to:

• I drive away = διώχνω
• you drive away = διώχνεις
• he/she/it drives away = διώχνει

Here the subject is το σπρέι, which is singular, so the verb is διώχνει.

Greek often omits subject pronouns when they are not needed, because the verb ending already gives information about the subject.

So instead of saying something like It drives away the mosquitoes, Greek can simply say:

• Το σπρέι διώχνει τα κουνούπια

The noun το σπρέι is enough to show the subject, so no separate it is necessary.

A few clues help:

1. Meaning: sprays drive away mosquitoes, not the other way around.
2. Verb agreement: διώχνει is singular, which matches το σπρέι.
3. Number: τα κουνούπια is plural, so it is less likely to be the subject here since the verb is singular.

One thing that can confuse learners is that neuter nominative and accusative often look the same in Greek. So:

• το σπρέι can be nominative or accusative
• τα κουνούπια can also be nominative or accusative plural

That means you often rely on context, meaning, and verb agreement.

Greek often uses the definite article more freely than English.

So τα κουνούπια can mean:

• the mosquitoes
• sometimes, in context, something close to mosquitoes in a general sense

In product descriptions or everyday speech, Greek often keeps the article where English might omit it.

For example, Greek may prefer:

• διώχνει τα κουνούπια

where English might say either:

• drives away the mosquitoes
• keeps mosquitoes away

The singular is:

• το κουνούπι = the mosquito

The plural is:

• τα κουνούπια = the mosquitoes

So the pattern is:

• κουνούπι → κουνούπια

This is a very common neuter noun pattern in Greek.

A rough pronunciation is:

• To SPRAY DYOH-hnee ta koo-NOO-pya

More carefully:

• Το = to
• σπρέι = SPRAY
• διώχνει = DYOH-hnee
  
  • the χν part may feel unfamiliar; χ is a throaty sound, not an English k
• τα = ta
• κουνούπια = koo-NOO-pya

The written stress marks show where the stress goes:

• σπρέι
• διώχνει
• κουνούπια

Yes, Greek word order is more flexible than English, although not completely free.

The most neutral order here is:

• Το σπρέι διώχνει τα κουνούπια.

But other orders are possible for emphasis, for example:

• Τα κουνούπια τα διώχνει το σπρέι.
  = It’s the mosquitoes that the spray drives away.

That version is more marked and emphatic. For a learner, the original sentence is the best basic pattern to remember.

Yes, διώχνει is very natural and common for this idea. It means something like:

• drives away
• keeps away
• chases away

It is especially common in everyday Greek for insects, animals, people, smells, and so on.

For example:

• Αυτό το φάρμακο διώχνει τα έντομα.
• Ο αέρας διώχνει τη ζέστη.

So in this sentence, διώχνει is a very good everyday choice.