Návštěvníci mohou přijít od šesti do devíti.

Návštěvníci means visitors. It is the nominative plural form of návštěvník (visitor).

The ending -i is used here because návštěvník is a masculine animate noun, and masculine animate nouns have a special nominative plural form. Since Návštěvníci is the subject of the sentence, the nominative is the correct case.

Mohou means can or may.

It is the 3rd person plural form of moci (to be able to / can), so it matches the plural subject Návštěvníci.

So:

• já mohu / můžu = I can
• ty můžeš = you can
• on/ona může = he/she can
• my můžeme = we can
• vy můžete = you can
• oni mohou / můžou = they can

In this sentence, mohou can mean either:

• are able to come
• are allowed to come

The exact nuance depends on context.

Because after a modal verb like moci (can), Czech normally uses an infinitive.

So mohou přijít literally works like can come.

This is similar to English:

• They can come not
• They can they come

In Czech:

• mohou přijít = they can come

This is a question of aspect.

• přijít is perfective
• přicházet is imperfective

In this sentence, přijít is natural because it refers to a completed arrival: the visitors may arrive within that time window.

So mohou přijít od šesti do devíti means something like:

• they may come/arrive any time between six and nine

If you used přicházet, it would suggest repeated or ongoing coming, which is less natural here unless you specifically mean people may be showing up continuously during that period.

Because the prepositions od (from) and do (to / until) require the genitive case.

So:

• šest → šesti
• devět → devíti

That is why you get:

• od šesti
• do devíti

This is a very common pattern in Czech:

• od pondělí do pátku = from Monday to Friday
• od rána do večera = from morning to evening
• od šesti do devíti = from six to nine

It can be understood as from six to nine, and in natural English the best translation is often between six and nine.

In this sentence, it means there is a time window during which visitors may come. So the idea is:

• visitors may come any time between 6:00 and 9:00

It does not usually mean that they come continuously for the entire period. It means the arrival is allowed/possible during that interval.

Most naturally, it means they can come / arrive during that time.

That is because přijít means to come / to arrive, not to stay.

So the sentence is about the time of arrival, not the whole visit.

If you wanted to say that visitors may be there from six to nine, Czech would more likely use a different verb, for example something with být (to be):

• Návštěvníci tu mohou být od šesti do devíti.

No, not necessarily.

In Czech, when talking about time, hodin is often omitted if the meaning is clear from context.

So both of these work:

• od šesti do devíti
• od šesti do devíti hodin

The version without hodin is very common and natural.

No. By itself, od šesti do devíti only says from six to nine. It does not specify:

• morning or evening
• 6:00–9:00 a.m.
• 6:00–9:00 p.m.

You need context to know that.

If someone wants to be very clear, they might add something else, such as:

• ráno = in the morning
• večer = in the evening

No, Czech word order is fairly flexible.

The neutral order here is:

• Návštěvníci mohou přijít od šesti do devíti.

But other word orders are possible, especially to change emphasis:

• Od šesti do devíti mohou návštěvníci přijít.
• Návštěvníci od šesti do devíti mohou přijít.

These versions still mean roughly the same thing, but the focus changes slightly. The original sentence sounds natural and neutral.

A rough pronunciation guide is:

NAHV-shtehv-nee-tsee MOH-hoh PREE-yeet ot SHES-tee doh deh-VYEE-tee

A few helpful notes:

• á is a long vowel
• ř is a special Czech sound, but there is no ř in this sentence
• š sounds like sh
• ci in návštěvníci sounds roughly like tsee
• přijít is pronounced approximately pree-yeet

If you want to sound more natural, pay attention to vowel length:

• návštěvníci
• mohou
• přijít
• devíti

Long vowels matter in Czech, both for pronunciation and meaning.