Kuulin oudon äänen.

I heard a strange sound.

Breakdown of Kuulin oudon äänen.

• kuulla: to hear
• ääni: the sound
• outo: strange; weird

Questions & Answers about Kuulin oudon äänen.

Why is kuulin used here instead of the dictionary form kuulla?

Kuulla is the infinitive, meaning to hear.
Kuulin is a finite verb form, meaning I heard.

It breaks down like this:

• kuul- = verb stem
• -i- = past tense marker
• -n = I / first person singular

So:

• kuulla = to hear
• kuulin = I heard

Finnish usually does not need the pronoun minä (I) here, because the ending -n already shows who did the action.

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Why is there no word for I in the sentence?

Because Finnish often leaves out subject pronouns when the verb ending already makes the subject clear.

In kuulin, the ending -n already tells you the subject is I. So:

• (Minä) kuulin oudon äänen.

Both are possible, but usually minä is omitted unless you want emphasis or contrast.

For example:

• Minä kuulin oudon äänen, mutta sinä et kuullut.
  I heard a strange sound, but you didn’t.

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Why is it oudon and not outo?