Ystäväni haluaa tulla kylään sunnuntai-iltana.

Ystäväni consists of:

• ystävä = friend
• -ni = my (1st person singular possessive suffix)

So ystäväni literally means “friend-my” → “my friend”.

Finnish can mark possession either:

• with a possessive suffix: ystäväni
• with a separate pronoun plus the suffix (more formal/neutral): minun ystäväni = my friend
• in colloquial speech often without the suffix: mun ystävä = my friend

So all of these can be used:

• Ystäväni haluaa…
• Minun ystäväni haluaa…
• (spoken) Mun ystävä haluaa…

Yes, on its own ystäväni is ambiguous:

• my friend (one person), or
• my friends (more than one)

You know which one is meant from context and from the verb form:

• Ystäväni haluaa tulla kylään…
  → haluaa = 3rd person singular → my friend wants…

• Ystäväni haluavat tulla kylään…
  → haluavat = 3rd person plural → my friends want…

So:

• singular: Ystäväni haluaa… = My friend wants…
• plural: Ystäväni haluavat… = My friends want…

In Finnish, verbs like haluta (to want) are followed by the infinitive form of the next verb, not a finite (conjugated) form.

• haluta (dictionary form) → haluaa (he/she wants)
• tulla = to come (1st infinitive)

The structure is:

• [conjugated “want”] + [infinitive]
• haluaa tulla = wants to come

Using two conjugated verbs (*haluaa tulee) is ungrammatical in Finnish. Other similar patterns:

• Haluan syödä. = I want to eat.
• He haluavat mennä. = They want to go.

Base word: kylä = village or (someone’s) place / home in some expressions.

Form in the sentence: kylään = illative case (direction “into / to”).

• kylä
  • -än → kylään = to the village / to someone’s place

In idiomatic Finnish, tulla kylään means:

• “to come over (to someone’s home) for a visit”

So:

• Ystäväni haluaa tulla kylään
  = My friend wants to come over (to my place) for a visit.

All are related to visiting, but with different nuances:

• tulla kylään

  • literally to come (to someone’s place)
  • everyday, warm, colloquial/neutral: come over for a visit

• käydä kylässä

  • käydä = to visit / to pop by / to go and come back
  • kylässä = in the village / at someone’s place (inessive case)
  • to visit someone, usually implying a completed visit
  • Example: Kävin eilen kylässä. = I visited (someone) yesterday.

• vierailla

  • more formal/neutral verb “to visit”
  • used for museums, cities, more official contexts:
    Vierailemme Helsingissä. = We are visiting Helsinki.

For a friendly home visit, tulla kylään is the most natural in this sentence.

This is a difference of direction vs. location:

• kylään = illative → to someone’s place (movement towards)

  • tulla kylään = to come over (to visit)

• kylässä = inessive → at someone’s place (being there)

  • olla kylässä = to be visiting / to be over at someone’s place
  • Olen kylässä. = I’m visiting (someone).

So:

• Ystäväni haluaa tulla kylään.
  = My friend wants to come (direction) for a visit.

If you wanted to say “My friend is visiting”, you’d use kylässä:

• Ystäväni on kylässä. = My friend is (here) visiting.

Finnish usually doesn’t use separate prepositions like to, on, in.
Instead, it encodes these meanings with case endings on nouns.

• kylään (illative) = to someone’s place (covers English to)
• sunnuntai-iltana (essive) = on Sunday evening (covers English on)

So Finnish uses:

• tulla kylään → literally “come to-the-place”
• sunnuntai-iltana → literally “as Sunday evening” → on Sunday evening

English needs prepositions; Finnish builds that information into the noun forms themselves.

The base noun is sunnuntai-ilta = Sunday evening.

In the sentence we have sunnuntai-iltana. The ending -na is the essive case.

• sunnuntai-ilta (basic form)
• sunnuntai-iltana (essive singular)

The essive is often used for time expressions meaning on X / at X:

• maanantaina = on Monday
• kesällä (this one uses adessive) = in (the) summer
• sunnuntai-iltana = on Sunday evening

Nuance:

• iltana → that specific evening (as that evening)
• illalla (adessive) → in the evening (more general)

So:

• Ystäväni haluaa tulla kylään sunnuntai-iltana.
  = My friend wants to come visit on Sunday evening (that particular Sunday evening).

Sunnuntai-ilta is a compound noun:

• sunnuntai = Sunday
• ilta = evening
• sunnuntai-ilta = Sunday evening

When you add a case ending to a compound, Finnish usually attaches the ending to the last part:

• sunnuntai-ilta
  • -na → sunnuntai-iltana

The hyphen stays to show it is one compound word.
So you get:

• sunnuntai-ilta (Sunday evening)
• sunnuntai-iltana (on Sunday evening)

Yes. Finnish word order is relatively flexible. All of these are grammatical:

1. Ystäväni haluaa tulla kylään sunnuntai-iltana.
   – Neutral, subject–verb–rest.

2. Sunnuntai-iltana ystäväni haluaa tulla kylään.
   – Puts time first; emphasizes on Sunday evening in contrast to other times.

3. Kylään ystäväni haluaa tulla sunnuntai-iltana.
   – Emphasizes the destination/visit, sounds a bit more marked or stylistic.

The basic meaning stays the same; changing the order mainly affects emphasis and information structure, not grammar.

You can use the conditional of haluta:

• haluaisi = would like / would want

So:

• Ystäväni haluaisi tulla kylään sunnuntai-iltana.
  = My friend would like to come visit on Sunday evening.

This sounds a bit softer or more tentative than haluaa (wants).

Finnish uses a special negative verb ei plus the stem of the main verb:

• positive: hän haluaa = he/she wants
• negative: hän ei halua = he/she does not want

So the full negative sentence:

• Ystäväni ei halua tulla kylään sunnuntai-iltana.
  = My friend does not want to come visit on Sunday evening.

Changes:

• haluaa → ei halua
• the rest (tulla kylään sunnuntai-iltana) stays the same.

The given sentence is standard written Finnish—perfectly normal, maybe a bit neutral/formal.

In everyday spoken Finnish, many people might say:

• Mun kaveri haluis tulla kylään sunnuntai-iltana.

Differences:

• mun instead of minun / possessive suffix
• kaveri instead of ystävä (friend, more casual)
• haluis instead of haluaisi or haluaa (spoken contraction)

But for learning and writing, Ystäväni haluaa tulla kylään sunnuntai-iltana is an excellent standard model.