Siivouspäivänä Laura pesee ikkunat, ja minä vien matot ulos.

The ending -na/-nä is the essive case. In time expressions, it often means on or during a particular day or occasion.

So siivouspäivänä means on cleaning day.

It is -nä rather than -na because of vowel harmony: the word contains front vowels such as ä, so the front-vowel version of the ending is used.

Because Finnish uses compound words very freely.

• siivous = cleaning
• päivä = day

Together, siivouspäivä means cleaning day. In Finnish, that kind of combination is normally written as one word, not two.

Pesee is the 3rd person singular present tense of pestä = to wash.

So:

• Laura pesee = Laura washes / is washing

Finnish present tense often covers both ideas that English separates into washes and is washing. The context tells you which is meant.

Here ikkunat is the object of the verb, and it is a plural total object.

That means the action is seen as affecting the whole set: Laura washes the windows.

In Finnish, a plural total object looks the same as the nominative plural, so you get ikkunat.

A learner often compares this with ikkunoita, which is the partitive plural. That would sound more indefinite or incomplete, more like:

• washing windows
• washing some windows

So ikkunat suggests a complete, bounded action affecting the windows as a whole.

Because the sentence joins two full clauses with different subjects:

• Laura pesee ikkunat
• minä vien matot ulos

In Finnish, when coordinated clauses like these are joined and each has its own subject, a comma is normally used before ja.

That is true: Finnish often omits subject pronouns when the verb ending already shows the person.

So vien matot ulos already means I take the rugs outside.

Here minä is probably included for contrast or clarity:

• Laura does one thing,
• I do another.

So the pronoun makes the contrast a little more explicit.

The dictionary form is viedä = to take / carry / bring.

In the present tense, this verb uses the stem vie-, so the 1st person singular is vien.

Some present-tense forms are:

• vien = I take
• viet = you take
• vie = he/she takes
• viemme = we take
• viette = you all take
• vievät = they take

So vien is just the normal present-tense form of viedä.

For the same reason: matot is also a plural total object.

• vien matot ulos = I take the rugs outside

This refers to the rugs as a whole set. If you used mattoja instead, it would sound more indefinite, like:

• I take some rugs outside
• I am taking rugs outside

So matot fits the idea of a complete action affecting specific rugs.

Ulos means out or outside, and it expresses movement toward the outside.

That is why it works well with viedä:

• vien matot ulos = I take the rugs outside

A useful comparison is:

• ulos = out, to the outside
• ulkona = outside, being outside

So ulos is about direction, not just location.

Not completely. Finnish word order is fairly flexible, and changing it often changes emphasis more than basic meaning.

In this sentence, Siivouspäivänä is placed first to set the time frame immediately:

• On cleaning day, Laura washes the windows...

You could also say:

• Laura pesee ikkunat siivouspäivänä, ja minä vien matot ulos

That is still grammatical, but it does not highlight the time expression as strongly at the beginning.

So the current word order is natural because it first tells you when, and then tells you who does what.

It can mean either, depending on context.

Both pesee and vien are present tense forms, but Finnish present tense is broad. It can describe:

• a habitual action
• a scheduled or typical action
• something happening now
• something happening in the relevant situation

In this sentence, because of Siivouspäivänä, it most naturally sounds like something that happens on cleaning day as part of that situation or routine.