Στη σούπα βάζω λίγο σέλινο και λίγα μπιζέλια, γιατί μου αρέσει η ελαφριά γεύση τους.

Yes. Greek word order is quite flexible, so Στη σούπα βάζω... is perfectly natural.

Starting with Στη σούπα puts a little focus on where the ingredients are being added: Into the soup, I put...

A more neutral order would also be possible:

• Βάζω λίγο σέλινο και λίγα μπιζέλια στη σούπα.

Both are correct. Greek often moves parts of the sentence around for emphasis or flow.

Στη is a contraction of:

• σε = in, to, at
• τη(ν) = the feminine singular definite article

So:

• σε τη σούπα → στη σούπα

This is very common in modern Greek.

You will also see similar forms:

• στο = σε + το
• στον = σε + τον
• στην = σε + την

In everyday writing, στη and στην are both seen, depending on pronunciation and style, but στη σούπα is completely standard.

Because σούπα is feminine singular, and after σε the noun here is in the accusative case.

For this noun, nominative and accusative look the same:

• nominative: η σούπα
• accusative: τη(ν) σούπα

So after στη, the noun appears as σούπα.

Βάζω means I put / I add.

In a sentence like this, the present tense often expresses a habitual action or a general cooking practice:

• Στη σούπα βάζω... = I put / I add ... to soup

It can also refer to what the speaker is doing right now, depending on context.

So Greek present tense here works much like English I put or I’m putting, depending on the situation.

Because λίγο and λίγα must agree with the noun.

• λίγο σέλινο: σέλινο is singular/neuter here, so we use λίγο
• λίγα μπιζέλια: μπιζέλια is plural/neuter, so we use λίγα

This is the same adjective, just in different forms.

Useful comparison:

• λίγος for masculine singular
• λίγη for feminine singular
• λίγο for neuter singular
• λίγοι / λίγες / λίγα for plural

Here:

• σέλινο = neuter singular
• μπιζέλια = neuter plural

This is mostly about how the foods are conceptualized.

• σέλινο is often treated like an ingredient or substance, so singular is natural: a little celery
• μπιζέλια refers to individual peas collectively, so plural is natural: a few peas / some peas

English does something similar:

• a little celery
• a few peas

So the Greek pattern is very natural.

They are in the accusative, because they are the direct objects of βάζω.

The speaker is putting what?

• λίγο σέλινο
• λίγα μπιζέλια

For neuter nouns like these, nominative and accusative often look the same, so you do not see a big form change.

Γιατί here means because.

So:

• ..., γιατί μου αρέσει... = ..., because I like...

A very common point for learners: γιατί can also mean why in questions.

Compare:

• Γιατί βάζεις σέλινο; = Why do you add celery?
• Βάζω σέλινο, γιατί μου αρέσει. = I add celery because I like it.

Same word, different function depending on sentence type.

Greek uses αρέσει differently from English like.

Literally, μου αρέσει means something like:

• it is pleasing to me

So:

• μου = to me
• αρέσει = pleases

That is why Greek says:

• Μου αρέσει η γεύση. literally: The taste pleases me.

This is a very important Greek pattern:

• Μου αρέσει ο καφές. = I like coffee.
• Μου αρέσουν τα βιβλία. = I like books.

The thing liked is the grammatical subject of αρέσει / αρέσουν.

Because the subject of αρέσει is η ελαφριά γεύση τους — their light taste — and that is singular.

The verb agrees with γεύση, not with σέλινο και μπιζέλια directly.

So:

• η γεύση = singular
• therefore αρέσει = singular

If the subject were plural, you would use αρέσουν.

Τους means their here, and it refers to σέλινο και μπιζέλια.

So:

• η ελαφριά γεύση τους = their light taste

This τους is a weak genitive form often used to mean their.

A learner should notice that Greek often expresses possession this way:

• το σπίτι μου = my house
• η φίλη σου = your friend
• η γεύση τους = their taste

Greek uses the definite article much more often than English.

So η ελαφριά γεύση τους is completely normal and natural:

• literally: the light taste of theirs
• naturally in English: their light taste

In Greek, the article is usually expected with nouns in this kind of structure.

Because it agrees with γεύση, which is:

• feminine
• singular
• nominative

So the adjective must also be feminine singular nominative:

• η ελαφριά γεύση

Agreement is a major feature of Greek adjectives.

Compare:

• ο ελαφρύς καφές = masculine singular
• η ελαφριά γεύση = feminine singular
• το ελαφρύ φαγητό = neuter singular

No. A very common alternative is αρακάς.

There can be a slight difference in usage depending on region, context, or whether you mean peas as a vegetable dish or as individual peas, but learners should know both words exist.

In this sentence, λίγα μπιζέλια is perfectly understandable and natural.

No, that would sound wrong in normal Greek.

You need the article:

• μου αρέσει η ελαφριά γεύση τους

Greek generally requires the article with a noun like γεύση in this kind of sentence. English is often more flexible here, but Greek is not.

Yes — it is a good example of several very common Greek patterns all at once:

1. Flexible word order

   • Στη σούπα βάζω...

2. Contraction with σε + article

   • στη

3. Adjective agreement

   • λίγο σέλινο
   • λίγα μπιζέλια
   • η ελαφριά γεύση

4. The Greek pattern for liking something

   • μου αρέσει...

5. Possession with weak pronouns

   • η γεύση τους

So even though the sentence is not very long, it contains several core grammar features that are extremely useful in everyday Greek.