Tässä on kahvi, ole hyvä.

Tässä usually means here.

Grammatically, it comes from tämä (this) plus the inessive ending -ssa / -ssä, so its literal sense is something like in this or in here. In everyday Finnish, though, it very often just functions as here.

So in this sentence, tässä introduces something being presented or handed over:

• Tässä on... = Here is...

Finnish normally needs the verb olla (to be) in this kind of sentence.

So:

• Tässä on kahvi = literally Here is coffee / Here is the coffee

This is a very common Finnish structure for presenting something:

• Tässä on avain. = Here is the key.
• Tässä on kirjasi. = Here is your book.

Even if English can sometimes omit the verb in casual speech, Finnish usually does not.

This is a very common learner question, because Finnish object and subject forms can be tricky.

Here, kahvi is in the nominative form. That is natural when the sentence presents a complete thing:

• Tässä on kahvi. = Here is the coffee / here is a coffee

If you said kahvia, that would be the partitive, which often suggests an uncountable amount, an incomplete quantity, or just some coffee:

• Tässä on kahvia. = Here is some coffee

So the difference is roughly:

• kahvi = a whole item / a serving / coffee as a presented thing
• kahvia = some coffee / an unspecified amount

Finnish does not have articles like English a/an and the.

So kahvi can mean:

• coffee
• a coffee
• the coffee

The exact meaning depends on context. If someone is handing you a cup, kahvi could naturally mean your coffee, the coffee, or a coffee, depending on the situation.

This is completely normal in Finnish, and learners have to get used to reading article-like meanings from context rather than from separate words.

Literally, ole hyvä means something like be good:

• ole = imperative singular of olla (to be)
• hyvä = good

But as a fixed expression, it usually means:

• here you are
• please
• you’re welcome

In this sentence, when handing someone coffee, ole hyvä is best understood as:

• here you are or
• please

So the literal meaning is not the important part here; it is an idiomatic expression.

No. Ole hyvä has several common uses.

It can mean:

1. Here you are — when giving something

   • Tässä on kahvi, ole hyvä.

2. Please — when inviting someone to do something

   • Ole hyvä ja istu. = Please sit down.

3. You’re welcome — in response to thanks

   • Kiitos.
   • Ole hyvä.

So it is a very useful phrase, but its exact meaning depends on the situation.

Ole hyvä is addressed to one person.

If you are speaking to:

• one person: ole hyvä
• several people or using the polite plural: olkaa hyvä

So:

• Tässä on kahvi, ole hyvä. = to one person
• Tässä on kahvi, olkaa hyvä. = to several people, or formally/politely to one person

Modern Finnish often uses singular forms quite widely, but olkaa hyvä is still important in polite or formal situations.

Both are possible, but they emphasize different things.

• Tässä on kahvi. = Here is the coffee.
  This is a natural way to present something.

• Kahvi on tässä. = The coffee is here.
  This puts more focus on kahvi and can sound more like you are identifying its location.

So in a handing-over situation, Tässä on kahvi is the more natural choice.

Finnish word order is fairly flexible, but it often changes the emphasis rather than the basic meaning.

The comma separates two parts:

• Tässä on kahvi
• ole hyvä

These are closely connected in meaning, but they are still separate units in writing. The comma helps show a small pause, like:

• Here is the coffee, here you are.

In speech, the pause may be very slight, but in writing the comma is normal.

Yes. Tässä on kahvi is already a complete sentence.

It has:

• tässä = here
• on = is
• kahvi = coffee

Then ole hyvä is added as a polite expression. So the full line is really:

• a statement/presentation: Here is the coffee
• plus a polite phrase: here you are / please

A few pronunciation points are especially important:

• tässä: the ä is not like English a. It is a front vowel, somewhat like the vowel in British cat, but not exactly the same.
• ss in tässä is a long consonant. Hold the s slightly longer than in English.
• kahvi: pronounce both consonants clearly: kah-vi.
• hyvä: both y and ä are front vowels that do not exist in the same way in English.
  
  • y is like a Finnish u pronounced with the lips rounded but the tongue more forward.
• Stress in Finnish usually falls on the first syllable:
  • TÄS-sä
  • KAH-vi
  • O-le
  • HY-vä

A simple rough guide for an English speaker would be:

• TESS-sah on KAH-vih, OH-leh HUU-vah

But that is only approximate, especially for y and ä.

Yes. Outside this sentence, tässä can definitely mean in this or in here, depending on context.

For example:

• Tässä kirjassa = in this book
• Tässä huoneessa = in this room / in here

But when tässä stands on its own, especially in a phrase like Tässä on..., it very often simply means here.

So this is one of those words whose most natural English translation changes with context.