Dej pádlo do kajaku.

Dát is the dictionary form, meaning to give / to put depending on context. In this sentence, dej is the imperative form, used for giving a command to one person: put!

So:

• dát = to give / to put
• dej = give! / put!

In this sentence, Dej pádlo do kajaku. means something like Put the paddle into the kayak.

Dej is the imperative for 2nd person singular, so it is used when speaking to one person informally.

Related forms:

• dej = say it to one person informally
• dejte = say it to more than one person, or to one person formally/politely

So if you were speaking politely to one person, or to a group, you would say:

• Dejte pádlo do kajaku.

Pádlo is in the accusative singular, because it is the direct object of the verb dej.

You are telling someone to put the paddle, so the paddle is the thing being moved.

The noun pádlo is neuter, and for many neuter nouns the nominative and accusative singular look the same:

• nominative: pádlo
• accusative: pádlo

So even though the form does not change, its role in the sentence is accusative.

Because the preposition do requires the genitive case.

The noun is:

• nominative: kajak = kayak

After do, it changes to genitive:

• genitive: kajaku

So:

• do kajaku = into the kayak

This is a very important Czech pattern: prepositions often require a specific case, and do takes the genitive.

Here do expresses movement into something.

So:

• do kajaku = into the kayak

This is different from just being located inside something. Czech often distinguishes:

• do
  • genitive = motion into
• v
  • locative = being in

For example:

• Dej pádlo do kajaku. = Put the paddle into the kayak.
• Pádlo je v kajaku. = The paddle is in the kayak.

Yes. Kajak is a masculine inanimate noun.

That helps explain forms like:

• nominative: kajak
• genitive: kajaku

Since do takes the genitive, you get do kajaku.

In Czech, subject pronouns are often omitted when they are clear from the verb form.

The form dej already tells you that the command is directed to you singular informal, so adding ty would usually be unnecessary:

• Dej pádlo do kajaku. = normal
• Ty dej pádlo do kajaku. = possible, but more emphatic, like you put the paddle into the kayak

So Czech usually leaves out the pronoun unless there is special emphasis.

No, Czech word order is fairly flexible, but the basic version here is very natural:

• Dej pádlo do kajaku.

This has a neutral command structure:

• verb first: Dej
• object next: pádlo
• destination last: do kajaku

Other word orders are possible, but they may change the emphasis:

• Pádlo dej do kajaku. = Put the paddle into the kayak.
• Do kajaku dej pádlo. = Put the paddle into the kayak.

So the original sentence is a straightforward, neutral way to say it.

A simple pronunciation guide is:

• Dej ≈ day
• pádlo ≈ paad-lo
• do ≈ do
• kajaku ≈ ka-ya-ku

A few useful points:

• Czech stress is usually on the first syllable of each word.
• á in pádlo is a long vowel, so it is held a bit longer than a short a.
• j in Czech sounds like English y in yes, so kajak sounds roughly like kayak, not with an English j sound.

Yes. Dát very often means to give, but in many contexts it also means to put / place something somewhere.

So in Czech, dát can be used more broadly than English give.

Examples:

• Dej mi to. = Give it to me.
• Dej to na stůl. = Put it on the table.
• Dej pádlo do kajaku. = Put the paddle into the kayak.

So this use is completely normal.

Yes. Czech has other verbs that can mean put depending on style and nuance.

For example:

• Vlož pádlo do kajaku. = Put/insert the paddle into the kayak.
• Polož pádlo do kajaku. = Put/place the paddle into the kayak.

But dej is very common in everyday speech and often sounds natural in simple instructions. It is a good basic verb to know.

Yes, it matters. Dát is a perfective verb, so dej tells someone to perform the action as a completed act: put it there.

That fits commands very well when you want one complete result.

In practice, Dej pádlo do kajaku. sounds like:

• Put the paddle into the kayak.
• complete that action

Learners do not always need to analyze aspect immediately, but it is useful to know that Czech often chooses a perfective verb in commands when the focus is on achieving the result.