A1 Morphology 1 min read 中等

Strong to Weak: K-P-T

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Grammar Rule in 30 Seconds

Finnish words change their middle consonants from 'strong' to 'weak' when you add certain endings.

  • K disappears or becomes a V/J: 'puku' (suit) -> 'puvun' (of the suit).
  • P becomes V: 'kauppa' (shop) -> 'kaupan' (of the shop).
  • T becomes D: 'katu' (street) -> 'kadun' (of the street).
Strong Stem (KPT) + Ending = Weak Stem (V/D/Ø)

K-P-T Gradation Patterns

Strong Weak Change Example
kk
k
kk -> k
kukka -> kukan
pp
p
pp -> p
kauppa -> kaupan
tt
t
tt -> t
katto -> katon
k
Ø
k -> Ø
puku -> puvun
p
v
p -> v
tapa -> tavan
t
d
t -> d
katu -> kadun

Meanings

Consonant gradation is a morphophonological process where specific consonants change their form based on the syllable structure of the word when suffixes are added.

1

Noun Inflection

Changing the stem of a noun when adding case endings like genitive -n.

“Kukka -> Kukan”

“Lippu -> Lipun”

2

Verb Conjugation

Changing the stem of a verb when conjugating in the present tense.

“Nukkua -> Nukun”

“Oppia -> Opin”

Reference Table

Reference table for Strong to Weak: K-P-T
Form Structure Example
Strong
Nominative
Kukka
Weak
Genitive
Kukan
Strong
Verb (3rd pers)
Nukkuu
Weak
Verb (1st pers)
Nukun
Strong
Nominative
Katu
Weak
Genitive
Kadun
Strong
Nominative
Puku
Weak
Genitive
Puvun

正式程度

正式
Kauppa on auki.

Kauppa on auki. (General)

中性
Kauppa on auki.

Kauppa on auki. (General)

非正式
Kauppa on auki.

Kauppa on auki. (General)

俚语
Kauppa on auki.

Kauppa on auki. (General)

K-P-T Transformation Map

K-P-T

K

  • k -> v/j/Ø weakening

P

  • p -> v weakening

T

  • t -> d weakening
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按水平分级的例句

1

Kissa on kotona.

The cat is at home.

2

Minulla on kaksi kissaa.

I have two cats.

3

Tämä on minun katu.

This is my street.

4

Asun tällä kadulla.

I live on this street.

1

Kuppi on pöydällä.

The cup is on the table.

2

Otan kupin kahvia.

I take a cup of coffee.

3

Hän nukkuu hyvin.

He sleeps well.

4

Minä nukun huonosti.

I sleep poorly.

1

Kauppa on kiinni.

The shop is closed.

2

Menen kaupan kautta.

I go via the shop.

3

Hän haluaa oppia suomea.

He wants to learn Finnish.

4

Minä opin uutta joka päivä.

I learn something new every day.

1

Puku on kallis.

The suit is expensive.

2

Puvun hinta on korkea.

The price of the suit is high.

3

Hän lukee kirjaa.

He is reading a book.

4

Minä luen uutisia.

I am reading the news.

1

Kukka kukkii keväällä.

The flower blooms in spring.

2

Kukan terälehdet ovat kauniita.

The flower's petals are beautiful.

3

Hän hakkaa puita.

He is chopping wood.

4

Minä hakaan puut.

I will chop the wood.

1

Katto on korkea.

The ceiling is high.

2

Katon väri on valkoinen.

The color of the ceiling is white.

3

Hän pitää tästä.

He likes this.

4

Minä pidän tästä.

I like this.

容易混淆

Strong to Weak: K-P-T 对比 Vowel Harmony

Both change word form.

Strong to Weak: K-P-T 对比 Case Endings

Learners forget to change the stem.

Strong to Weak: K-P-T 对比 Verb Stems

Mixing up strong and weak.

常见错误

✗

katun

✓

kadun

T changes to D.
✗

pukun

✓

puvun

K disappears.
✗

kauppan

✓

kaupan

PP becomes P.
✗

kukkas

✓

kukan

Wrong case ending.
✗

nukkuan

✓

nukun

Failed to weaken.
✗

oppin

✓

opin

PP becomes P.
✗

halutan

✓

haluan

T disappears.
✗

tapan

✓

tavan

P becomes V.
✗

luken

✓

luen

K disappears.
✗

pitan

✓

pidän

T becomes D.
✗

hakkan

✓

hakaan

KK becomes K.
✗

kattun

✓

katon

TT becomes T.
✗

pukkuan

✓

puvun

Over-complication.

句型

Minä ___ (verb) ___.

Tämä on ___ (noun).

Tämä on ___ (noun) genitive.

Minä pidän ___ (noun).

Real World Usage

Texting constant

Tuun kaupan kautta.

Ordering food very common

Yksi kupin kahvia.

Job interview common

Opin nopeasti.

Travel common

Missä on katu?

Social media common

Kissa nukkuu.

Food delivery common

Tilaan kaupan.

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💡

Check the stem

Always look at the nominative form first.
⚠️

Don't over-apply

Not all words change.
🎯

Listen to natives

They do it automatically.
💬

Practice

Say it out loud.

Smart Tips

Check for K, P, T.

katun → kadun

Check the stem.

nukkuan → nukun

Look for the root.

kauppan → kaupan

Relax your tongue.

pukkuan → puvun

发音

k -> Ø

Weakening

The sound becomes softer and shorter.

Statement

Katu on pitkä.

Falling intonation.

记住它

记忆技巧

K-P-T: Keep Playing Together, but when the door closes, they change their clothes.

视觉联想

Imagine a strong 'K' turning into a soft 'v' like a bird flying away.

Rhyme

K becomes nothing, P becomes V, T becomes D, as you will see.

Story

Kalle (K) goes to the shop (kauppa). He buys a suit (puku). He walks on the street (katu). Every time he adds an ending, his name and his items change their sounds.

Word Web

KukkaKauppaKatuPukuNukkuaOppia

挑战

Take 5 words with K, P, or T and try to conjugate them in the genitive case.

文化笔记

This rule is taught in every Finnish school.

Often drops consonants even more.

Has different gradation rules.

Ancient Finnic phonological processes.

对话开场白

“

Mikä on sinun suosikkikauppa?

“

Mitä sinä luet?

“

Missä sinä asut?

“

Pidätkö suomen kielestä?

日记主题

Write about your street.
Write about your favorite shop.
Write about what you are reading.
Write about your daily habits.

常见错误

Incorrect

正确

Incorrect

正确

Incorrect

正确

Incorrect

正确

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Test Yourself

Fill in the correct form.

Katu -> ___

✓ Correct! ✗ Not quite. Correct answer: kadun
T becomes D.
Choose the correct form. 多项选择

Kauppa -> ___

✓ Correct! ✗ Not quite. Correct answer: kaupan
PP becomes P.
Correct the error. Error Correction

Find and fix the mistake:

Minä nukkuan.

✓ Correct! ✗ Not quite. Correct answer: Minä nukun.
KK becomes K.
Transform to genitive. Sentence Transformation

Puku

✓ Correct! ✗ Not quite. Correct answer: Puvun
K disappears.
Is this true? True False Rule

T becomes D.

✓ Correct! ✗ Not quite. Correct answer: True
Yes, in gradation.
Complete the dialogue. Dialogue Completion

A: Missä on kauppa? B: ___ on tuolla.

✓ Correct! ✗ Not quite. Correct answer: Kauppa
Nominative.
Build the sentence. Sentence Building

Minä / nukkua / hyvin.

✓ Correct! ✗ Not quite. Correct answer: Minä nukun hyvin.
Verb conjugation.
Match the pairs. Match Pairs

Match each item on the left with its pair on the right:

✓ Correct! ✗ Not quite. Correct answer: Correct
Both are correct.

Score: /8

练习题

8 exercises
Fill in the correct form.

Katu -> ___

✓ Correct! ✗ Not quite. Correct answer: kadun
T becomes D.
Choose the correct form. 多项选择

Kauppa -> ___

✓ Correct! ✗ Not quite. Correct answer: kaupan
PP becomes P.
Correct the error. Error Correction

Find and fix the mistake:

Minä nukkuan.

✓ Correct! ✗ Not quite. Correct answer: Minä nukun.
KK becomes K.
Transform to genitive. Sentence Transformation

Puku

✓ Correct! ✗ Not quite. Correct answer: Puvun
K disappears.
Is this true? True False Rule

T becomes D.

✓ Correct! ✗ Not quite. Correct answer: True
Yes, in gradation.
Complete the dialogue. Dialogue Completion

A: Missä on kauppa? B: ___ on tuolla.

✓ Correct! ✗ Not quite. Correct answer: Kauppa
Nominative.
Build the sentence. Sentence Building

Minä / nukkua / hyvin.

✓ Correct! ✗ Not quite. Correct answer: Minä nukun hyvin.
Verb conjugation.
Match the pairs. Match Pairs

Kukka/Kukan, Katu/Kadun

✓ Correct! ✗ Not quite. Correct answer: Correct
Both are correct.

Score: /8

常见问题 (8)

It's a phonological rule to make speech easier.

No, only those with K, P, T.

It takes practice but becomes natural.

No, you will sound unnatural.

When adding suffixes.

Yes, some loanwords.

Use flashcards.

No, completely different.

Scaffolded Practice

1

1

2

2

3

3

4

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

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In Other Languages

Spanish none

None

No stem changes.

French none

None

No stem changes.

German none

None

No stem changes.

Japanese none

None

No stem changes.

Arabic none

None

Different system.

Chinese none

None

No conjugation.

Learning Path

Prerequisites

Next
Quantitative Gradation

Related Grammar Rules

A0

Suffix Harmony Rules
A1

Quantitative Gradation
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