Musíme přestat čekat.

• Musíme is the finite verb: we must / we have to
• přestat is an infinitive: to stop
• čekat is another infinitive: to wait

So the pattern is:

muset + přestat + infinitive

This is the Czech way to say must stop doing something.

Because Czech often drops subject pronouns when they are clear from the verb ending.

In musíme, the ending -íme already tells you the subject is we.

So:

• Musíme přestat čekat = We must stop waiting
• My musíme přestat čekat = also possible, but my adds emphasis, like we in we must stop waiting

This is very normal in Czech.

Musíme is the 1st person plural present-tense form of muset.

Here is the basic present tense of muset:

• musím = I must
• musíš = you must
• musí = he/she/it must
• musíme = we must
• musíte = you must
• musí = they must

So the -me part helps mark we, and the full form musíme is simply the correct conjugated form.

Because muset is a modal verb, and modal verbs are commonly followed by an infinitive.

So:

• musíme přestat = we must stop

Then přestat itself can be followed by another infinitive that names the activity being stopped:

• přestat čekat = stop waiting

So the whole chain is completely normal:

• Musíme přestat čekat

English does something similar, but with an -ing form: must stop waiting.

Because Czech does not use an English-style -ing form here.

After přestat, Czech normally uses an infinitive to express the activity:

• přestat čekat = stop waiting
• přestat mluvit = stop talking
• přestat kouřit = stop smoking

Czech can also turn the action into a noun:

• přestat s čekáním

But that is a different structure, literally something like stop with the waiting. In this sentence, přestat čekat is the most natural and direct pattern.

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

• přestat is perfective
• přestávat is imperfective

Přestat focuses on reaching the endpoint: the action comes to a stop.

That is exactly what you want in:

• Musíme přestat čekat = we need to bring the waiting to an end

Přestávat would suggest something more ongoing, repeated, or gradual, like to be stopping or to stop gradually / habitually, which is not the normal choice here.

So přestat is the natural verb.

Čekat is an imperfective verb, and that fits the meaning because waiting is an ongoing activity.

You usually stop an activity that is in progress, so:

• přestat čekat = stop waiting

A related perfective verb is počkat, but that means something more like wait for a bit / wait until. It does not fit naturally in this sentence.

So čekat is the right choice because it names the ongoing activity that must end.

The given order is the neutral, standard one:

• Musíme přestat čekat.

Czech word order is more flexible than English, but different orders usually change emphasis.

For example, a rearranged version might sound contrastive or dramatic, not neutral. In ordinary speech, the original order is the safest and most natural.

Also, přestat čekat works as a close verbal unit, so you normally keep those two together.

A rough guide:

• Musíme ≈ MOO-see-meh
• přestat ≈ przhes-taht (approximate only)
• čekat ≈ CHEH-kaht

A few useful points:

• Czech stress is usually on the first syllable of each word:
  • MUsíme
  • PŘEstat
  • ČEkat
• č sounds like ch in check
• ř is a special Czech sound with no exact English equivalent. It is often described as something between r and zh. Many learners approximate it at first, and that is normal.
• í in musíme is a long vowel

So even if your ř is not perfect yet, the sentence will still be understood.

Usually, it can mean either, depending on context.

So:

• Musíme přestat čekat can be understood as
  • We must stop waiting
  • We have to stop waiting

Czech muset covers both strong necessity and practical necessity. The exact nuance comes from the situation, tone, and context.

The most direct negative is:

• Nemusíme přestat čekat.

But be careful: this means

• We do not have to stop waiting

It does not mean

• We must not stop waiting

That same distinction exists in English and is important in Czech too.

If you want the idea we must not continue waiting, Czech would usually say something like:

• Nesmíme dál čekat.

So:

• nemusíme = we do not have to
• nesmíme = we must not / we are not allowed to

Yes, that is grammatical.

• Musíme přestat čekat = the most direct, natural way to say it
• Musíme přestat s čekáním = also possible, but more noun-based

The second version uses:

• přestat s + instrumental

Here, čekáním is the instrumental form of čekání.

Both are correct, but in a simple sentence like this, přestat čekat is usually the more natural everyday choice.