Savi kutistuu uunissa.

Savi is the subject of the sentence, so it is in the nominative singular, which is the basic dictionary form.

• savi = clay
• nominative singular = savi

In Savi kutistuu uunissa, savi is the thing that is shrinking.

Kutistuu is the 3rd person singular present tense form of the verb kutistua, meaning to shrink or to become smaller.

So:

• kutistua = to shrink
• kutistuu = shrinks / is shrinking

Because the subject savi is singular, the verb is also singular.

Finnish present tense often covers both the English simple present and present progressive.

So Savi kutistuu uunissa can mean:

• The clay shrinks in the oven
• The clay is shrinking in the oven

Which one sounds more natural depends on context. Finnish usually does not make that distinction as clearly as English does.

Uunissa is in the inessive case, which usually means in or inside something.

• uuni = oven / kiln
• uunissa = in the oven / in the kiln

The inessive ending is -ssa / -ssä.
Here it shows the place where the shrinking happens.

Finnish does not have articles like English a, an, or the.

So savi can mean:

• clay
• the clay

And uunissa can mean:

• in an oven
• in the oven

The exact meaning depends on context.

Literally, uuni usually means oven. But in context, especially with clay or ceramics, it can also refer to a kiln.

So if the sentence is about pottery or firing clay, English might naturally translate it as:

• The clay shrinks in the kiln

Even though the Finnish word is still uuni.

Because kutistua is an intransitive verb. That means it describes something happening to the subject itself and does not take a direct object.

Here:

• savi = the thing undergoing the change
• kutistuu = shrinks

Compare this with the transitive verb kutistaa, which means to shrink something.

For example:

• Savi kutistuu. = The clay shrinks.
• Kuumuus kutistaa savea. = Heat shrinks the clay.

Yes. Finnish word order is fairly flexible, although Savi kutistuu uunissa is a neutral, natural order.

Possible alternatives include:

• Uunissa savi kutistuu.
• Savi uunissa kutistuu.

These versions change the emphasis a little:

• starting with uunissa emphasizes the place
• starting with savi is the most straightforward neutral choice

So the original sentence is probably the best basic version for learners.

It can describe either one.

Finnish present tense is often used for:

• general truths
  
  • Clay shrinks in the oven
• something happening now
  
  • The clay is shrinking in the oven

Only the context tells you which meaning is intended.

The verb’s dictionary form is kutistua. When Finnish makes the 3rd person singular present, many verbs of this type end in a doubled vowel.

So:

• kutistua → kutistuu

This is just the normal conjugation pattern for the verb.

A simple pronunciation guide is:

• savi ≈ SAH-vi
• kutistuu ≈ ku-tis-TOO
• uunissa ≈ OO-nih-ssah

A few important points:

• uu is a long vowel, so hold it slightly longer
• ss is a long s sound
• stress in Finnish usually falls on the first syllable of each word

So the rhythm is roughly:

SA-vi KU-tis-tuu UU-ni-ssa

Here savi is being used as a material noun, like clay in English.

So it refers to the substance itself, not to one separate item. That is why English often translates it simply as clay, not a clay.

If you wanted to talk about a specific clay object instead, Finnish would usually use a different noun depending on what the object is.