Zametám kuchyni, protože je tam nepořádek.

Kuchyni is the accusative singular form of kuchyně (kitchen). After zametat when the kitchen is the thing being swept, Czech treats it as a direct object, so it goes into the accusative.

• dictionary form: kuchyně
• in this sentence: kuchyni

So Zametám kuchyni = I am sweeping the kitchen.

Zametám is the 1st person singular present tense of zametat.

It literally means I sweep or I am sweeping. Czech present tense often covers both:

• I sweep (habitually)
• I’m sweeping (right now)

Here, because of the context, it most naturally sounds like I’m sweeping the kitchen.

Czech often leaves out subject pronouns when they are clear from the verb ending. The ending -ám in zametám already tells you the subject is I.

So:

• Zametám kuchyni = I am sweeping the kitchen
• Já zametám kuchyni is also possible, but it adds emphasis, like I’m the one sweeping the kitchen.

Because protože introduces a subordinate clause. In Czech, clauses of this kind are normally separated by a comma.

So:

• Zametám kuchyni, protože je tam nepořádek.

This is standard Czech punctuation, even though English often does not use a comma before because in the same kind of sentence.

Protože means because.

It introduces the reason:

• Zametám kuchyni = the action
• protože je tam nepořádek = the reason

So the sentence structure is:

• I’m sweeping the kitchen, because there’s a mess there.

Literally, it is something like there is mess there or is there mess if you follow Czech word order too closely.

Natural English equivalents are:

• there is a mess there
• it’s messy in there
• the place is untidy

Nepořádek means mess / disorder / untidiness.

Because nepořádek is a singular noun. Czech agrees the verb with the noun, so:

• je nepořádek = there is a mess
• if it were plural, the verb would be plural too

Even though English may sometimes say it’s messy, Czech is literally using a noun: a mess / disorder is there.

Tam literally means there, but in this sentence it really means something like in there / in that place. It refers back to the kitchen.

So:

• je tam nepořádek = there’s a mess in there

You could also say:

• protože je v kuchyni nepořádek = because there is a mess in the kitchen
• protože je v ní nepořádek = because there is a mess in it

Using tam sounds very natural and conversational.

Yes, but it means something slightly different.

• Zametám kuchyni = I’m sweeping the kitchen
  The kitchen is the object being swept.

• Zametám v kuchyni = I’m sweeping in the kitchen
  This tells you the location, but not necessarily what exactly is being swept.

So the original sentence focuses on the kitchen as the thing being cleaned.

Yes. Czech word order is flexible, and changing it usually changes emphasis, not the core meaning.

For example:

• protože je tam nepořádek = neutral
• protože tam je nepořádek = a bit more emphasis on there
• protože nepořádek je tam = possible only in special contexts, but not natural here

The version in the sentence is the most normal one.

Because Czech has no articles like a or the.

So:

• je tam nepořádek can correspond to there is a mess there
• or more loosely it’s messy there

Czech leaves that kind of definiteness to context instead of using articles.

Zametám specifically means I’m sweeping. It suggests using a broom or sweeping the floor.

If you wanted a more general idea of cleaning, you might use:

• Uklízím kuchyni = I’m cleaning/tidying the kitchen

So:

• zametám = specifically sweeping
• uklízím = more general cleaning/tidying

The original sentence is specifically about sweeping because there is a mess.

Yes. The perfective partner is zamést.

Compare:

• Zametám kuchyni = I’m sweeping the kitchen / process, ongoing action
• Zametu kuchyň = I’ll sweep the kitchen / I will get it done, completed action

In this sentence, zametám works well because it describes the action as currently happening or in progress because of the mess.