Lisään vähän pesuainetta veteen ja pesen tiskit käsin.

I add a little detergent to the water and wash the dishes by hand.

Breakdown of Lisään vähän pesuainetta veteen ja pesen tiskit käsin.

• minä: I
• ja: and
• vesi: the water
• lisätä: to add
• -een: to
• pestä: to wash
• vähän: a little
• käsin: by hand
• pesuaine: the detergent
• tiskit: the dishes

Questions & Answers about Lisään vähän pesuainetta veteen ja pesen tiskit käsin.

Why is it lisään and pesen? What form are these verbs?

Both are 1st person singular present tense, so they mean I add and I wash.

• lisätä → lisään = I add
• pestä → pesen = I wash

In Finnish, you usually do not need to say minä if the verb ending already shows who the subject is. Here, -n marks I.

So:

• lisään = I add
• pesen = I wash

That is why the sentence can work without minä.

Why is pesuainetta in the form -tta instead of the basic form pesuaine?

This is because of vähän, which usually requires the following noun to be in the partitive singular.

• pesuaine = detergent
• vähän pesuainetta = a little detergent

This is very common in Finnish:

• vähän vettä = a little water
• vähän aikaa = a little time
• vähän rahaa = a little money

So even though English says a little detergent, Finnish expresses this with vähän + partitive.

Why is veteen used? What case is that?

Veteen is the illative form of vesi (water), and it means into the water.

• vesi = water
• veteen = into the water

The verb lisätä often takes:

• the thing being added as the object
• the place/container as something like into X

So:

• Lisään vähän pesuainetta veteen = I add a little detergent to/into the water

English says to the water, but Finnish often uses a form that literally feels more like into the water.

Why does vesi become veteen? That seems very irregular.

Yes, vesi is an irregular-looking word type and changes its stem in many forms.

Some common forms are:

• vesi = water
• veden = of the water
• vettä = water (partitive)
• veteen = into the water

So the stem changes between ves- / ved- / vet- depending on the form. This is something learners usually just have to get used to through exposure and memorization.

Finnish has a small group of nouns like this that do not behave like the most regular noun types.

Why is it tiskit and not tiskejä?

Here tiskit is the object of pesen.

• tiskit = the dishes / dishes
• pesen tiskit = I wash the dishes

In this sentence, the action is understood as a complete whole: washing the dishes as a finished task. Because of that, Finnish uses the total object.

For plural nouns, the total object often looks like the nominative plural:

• tiskit

Compare:

• Pesen tiskit. = I wash the dishes. / I’ll wash the dishes.
  (the whole set, completed action)
• Pesen tiskejä. = I am washing dishes / I wash some dishes.
  (partitive plural, incomplete / unspecified amount / ongoing activity)

So tiskit suggests the dishes are treated as a whole task.

Is tiskit singular or plural? And what exactly does tiski mean here?

Tiskit is plural.

• tiski can mean things like counter or dishwashing-related item depending on context
• tiskit very commonly means the dishes in everyday Finnish

So in this sentence:

• pesen tiskit = I wash the dishes

This is a very common fixed everyday expression. Learners often meet tiskata too:

• tiskata = to do the dishes / wash dishes

So this sentence could be seen as a more literal version using pestä:

• pestä tiskit = to wash the dishes

What does käsin mean, and why is it not kädellä or käsillä?

Käsin means by hand or with one’s hands.

It is a special adverbial form, traditionally called the instructive in many grammar descriptions.

So:

• käsin = by hand

In this sentence:

• pesen tiskit käsin = I wash the dishes by hand

This is the normal expression. Even though a learner might expect something based on käsi (hand) plus a more familiar case ending, Finnish simply uses käsin in this kind of phrase.

Some similar adverbial-style expressions are:

• jalan / jalkaisin = on foot
• omin käsin = with one’s own hands

The important thing for a learner is that käsin is the standard way to say by hand.

Why is the sentence ordered Lisään vähän pesuainetta veteen ja pesen tiskit käsin? Could the word order change?

Yes, Finnish word order is fairly flexible, but this order is very natural and neutral.

The sentence starts with the verbs:

• Lisään ...
• ja pesen ...

This gives a straightforward I do this, and then I do that structure.

Other orders are possible for emphasis. For example:

• Veteen lisään vähän pesuainetta...
  = emphasizes into the water
• Tiskit pesen käsin.
  = emphasizes the dishes

But the original order is the most neutral everyday version.

Finnish often uses word order to show focus or emphasis, not just grammar.

Why is there no word for the in Finnish, even though English says the water or the dishes?

Finnish does not normally use articles like the or a/an.

So Finnish simply says:

• veteen = into the water / into water
• tiskit = the dishes / dishes

The exact meaning is understood from context.

That means Finnish learners coming from English must get used to the fact that definiteness is usually not marked with a separate word. Instead, Finnish relies on:

• context
• word choice
• case forms
• whether the object is total or partitive

So tiskit here naturally comes across as the dishes, even without a word meaning the.

Why is there no pronoun like it or them after pesen? In English we often need one.

Because Finnish can directly use the noun as the object without needing an extra pronoun.

Here:

• pesen tiskit = I wash the dishes

There is no need for anything like them because tiskit itself is already the object.

If the speaker wanted to use a pronoun instead, Finnish could do that, but it is not necessary here.

So the sentence is completely natural as it is.

Could this sentence also be expressed with tiskaan instead of pesen tiskit?

Yes. Finnish often uses the verb tiskata, which means to do the dishes or to wash dishes.

So a similar sentence could be:

• Lisään vähän pesuainetta veteen ja tiskaan käsin.

That also sounds natural.

The difference is mainly this:

• pesen tiskit = literally I wash the dishes
• tiskaan = I do the dishes

In your sentence, pesen tiskit is perfectly correct and very understandable, but learners should know that tiskata is also very common in everyday Finnish.