Je třeba odpojit pračku, protože filtr je rozbitý.

Je třeba is an impersonal expression meaning it is necessary, it is needed, or more naturally in English, it is necessary to.

So:

• Je třeba odpojit pračku. = It is necessary to disconnect the washing machine.

A few important points:

• It does not name who must do it.
• It sounds fairly neutral and standard.
• It is commonly followed by an infinitive:
  
  • Je třeba počkat. = It is necessary to wait.
  • Je třeba zavolat opraváře. = It is necessary to call a repairman/technician.

Similar expressions:

• je nutné = it is necessary
• je potřeba = it is necessary / needed

Because je třeba is followed by an infinitive to express what needs to be done.

So the structure is:

• je třeba + infinitive

In this sentence:

• odpojit = to disconnect / unplug

That is why Czech uses:

• Je třeba odpojit pračku.

not a finite verb like odpojí or odpojuje.

This works much like English:

• It is necessary to disconnect the washing machine.

This is about aspect, which is very important in Czech.

• odpojit = perfective
• odpojovat = imperfective

Here, the sentence refers to a single complete action: the washing machine needs to be disconnected. That is why odpojit is the natural choice.

Compare:

• Je třeba odpojit pračku.
  = The machine needs to be disconnected once, as a complete action.

• Odpojovat pračku would suggest the process, repetition, or habitual action, which does not fit as well here.

So in practical terms, odpojit matches English disconnect / unplug as one completed act.

Because pračku is the accusative singular of pračka.

• dictionary form: pračka = washing machine
• accusative singular: pračku

It is in the accusative because it is the direct object of odpojit:

• odpojit co? = disconnect what?
• pračku

This is a very common pattern with transitive verbs in Czech.

For feminine nouns ending in -a, the accusative singular often changes:

• žena → ženu
• taška → tašku
• pračka → pračku

Because filtr is the subject of the clause filtr je rozbitý.

That clause means:

• the filter is broken

The subject normally appears in the nominative case, and here the nominative singular is simply:

• filtr

So:

• filtr = nominative singular
• je rozbitý = is broken

Unlike pračku, which is an object and therefore accusative, filtr is the subject of its clause.

Rozbitý is an adjective meaning broken.

It has this form because it must agree with filtr in:

• gender
• number
• case

Here, filtr is:

• masculine inanimate
• singular
• nominative

So the adjective must also be:

• masculine inanimate
• singular
• nominative

That gives:

• rozbitý

Compare with other nouns:

• pračka je rozbitá = the washing machine is broken
  (pračka is feminine, so rozbitá)

• okno je rozbité = the window is broken
  (okno is neuter, so rozbité)

Because Czech often uses impersonal constructions where English uses it.

In English, we say:

• It is necessary to disconnect the washing machine.

But in Czech, je třeba already works as a complete impersonal expression. Czech does not need a dummy subject like English it.

So Czech says simply:

• Je třeba odpojit pračku.

This is very normal. Czech often leaves out subjects that English requires.

Protože means because. It introduces the reason.

So the sentence has two parts:

1. Je třeba odpojit pračku
   = It is necessary to disconnect the washing machine

2. protože filtr je rozbitý
   = because the filter is broken

Together:

• It is necessary to disconnect the washing machine because the filter is broken.

Protože introduces a subordinate clause, but Czech word order after it is often more flexible than in English.

Yes, protože je filtr rozbitý is also possible.

Czech word order is more flexible than English, and both versions are understandable. However, they can sound slightly different in emphasis.

• protože filtr je rozbitý
  puts a bit more focus on filtr

• protože je filtr rozbitý
  may sound slightly more neutral to some speakers

In everyday Czech, word order often depends on emphasis, rhythm, and style rather than strict rules. So learners should know that Czech is flexible here.

Yes, a similar idea could be expressed with musí se:

• Pračku je třeba odpojit.
• Pračka se musí odpojit.

Both mean roughly that the washing machine needs to be disconnected, but there is a slight difference in style:

• je třeba = more neutral, formal, or impersonal
• musí se = more direct, closer to must

So:

• Je třeba odpojit pračku.
  = It is necessary to disconnect the washing machine.

• Pračka se musí odpojit.
  = The washing machine must be disconnected.

Both are good Czech, but je třeba sounds a bit less forceful.

It describes a state: the filter is in a broken condition.

• filtr je rozbitý = the filter is broken

This does not focus on the event of breaking. If you wanted to emphasize that the filter has broken, Czech might use a verb such as:

• Filtr se rozbil. = The filter broke / has broken.

So the difference is:

• je rozbitý = state
• se rozbil = event

In your sentence, the state is what matters, because that state is the reason the washing machine must be disconnected.

It can mean either, depending on context.

• odpojit generally means disconnect
• with an electrical appliance like pračka, it often naturally suggests unplugging or disconnecting it from power

So in this sentence, English could translate it as:

• disconnect the washing machine
• unplug the washing machine

If Czech wanted to be very specific about removing the plug from the socket, it might use more explicit wording, but odpojit pračku is completely natural here.