You might have noticed something strange in your Czech vocabulary lists.

For almost every English verb, there seem to be two different Czech verbs.

For example, the verb “to write” is both psát and napsat.

Why do we need two verbs for the exact same action?

This is because of something called verbal aspect (in Czech, vid).

While it sounds like a hard grammar term, verbal aspect is actually a very logical system. Once you understand the basic idea behind it, learning Czech verbs becomes way easier.

I’ll explain the difference between perfective and imperfective verbs simply and clearly.

What is verbal aspect in Czech?

In English, you change the tense to show how an action is happening. You say “I was reading” to show an ongoing action, and “I read the book” to show you finished it.

In Czech, we do not use complex tenses like “was reading” or “have read”. Instead, we change the actual verb itself.

Almost every verb in Czech comes as a pair. One verb is imperfective (ongoing or repeated) and the other is perfective (completed).

Together, they form an “aspect pair.” They mean the exact same thing, but they view the action differently.

Imperfective verbs (the video camera)

I like to tell my students to think of imperfective verbs like a video camera.

A video records a process. It focuses on the action happening over time, without caring about the finish line.

You use imperfective verbs when:

• The action is currently happening (process).
• The action happens often or regularly (repetition).
• You are focusing on the duration of the action, not the result.

Let’s look at the imperfective verb číst (to read).

In all these examples, we are focused on the act of reading itself, not whether the book was finished.

Perfective verbs (the camera snapshot)

Now, think of perfective verbs like taking a photograph.

A photograph captures a single, complete moment. It focuses entirely on the result or the completion of an action. The finish line has been crossed.

You use perfective verbs when:

• The action is completely finished (a one-time completed event).
• You want to emphasize the result, not the process.

Let’s look at the perfective version of our reading verb, which is přečíst (to read completely/to finish reading).

Notice how perfective verbs are never used for things that happen “often” or “regularly”. They are only for a specific, completed event.

How to tell perfective and imperfective verbs apart

So, how do you know which verb is which? Luckily, there are a few common patterns that Czech uses to create these pairs.

(A quick note on regional variations: While the system of aspect is identical everywhere in the Czech Republic, the specific prefixes used in slang can sometimes change depending on if you are in Bohemia or Moravia. However, the standard rules below apply everywhere!)

1. Adding a prefix

Most commonly, you take an imperfective base verb and add a prefix to the front to make it perfective (completed).

• psát (imperfective) -> napsat (perfective)
• dělat (imperfective) -> udělat (perfective)

2. Changing the suffix

Sometimes, the perfective verb is the shorter base word, and we make it imperfective (ongoing) by adding a longer suffix to the end.

• koupit (perfective) -> kupovat (imperfective)
• dát (perfective) -> dávat (imperfective)

3. Totally different words

In a few rare cases, the perfective and imperfective verbs look completely different! You just have to memorize these.

• brát (imperfective) -> vzít (perfective - to take)
• vidět (imperfective) -> uvidět (perfective - to see)

Why perfective verbs have no present tense

Here is a big secret that makes learning Czech grammar much easier: perfective verbs do not have a present tense!

Think about it logically. If an action is completed, it cannot be happening right now in the present. The moment you finish it, it belongs to the past.

Because of this, perfective verbs only exist in the past and the future.

Even better, to talk about the future with a perfective verb, you just conjugate it using the normal present tense endings!

Let’s compare:

This means you don’t have to learn a complicated future tense formula for perfective verbs. Just add the prefix and use the present tense endings, and suddenly you are speaking in the future tense!

Common verb pairs you should know

To help you get started, here is a list of the most common Czech verb pairs.

I highly recommend learning verbs as a pair right from the beginning. Whenever you learn a new verb, ask yourself: “What is its perfective/imperfective partner?”

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Verbal aspect might seem weird at first, but it is just the Czech way of being very precise about time.

Remember the camera analogy:

• Use imperfective verbs for the video recording (ongoing, repeated, present actions).
• Use perfective verbs for the photo snapshot (completed, one-time, finished actions).

Keep practicing with the common pairs above, and soon you will naturally feel which verb to choose.