The Reflexive Pronouns se and si

English has a whole family of reflexive pronouns — myself, yourself, himself, ourselves — one for each person. Czech has exactly one reflexive pronoun, and it does the job for every person, singular and plural. There is no me-self versus him-self: the same little word covers I wash myself, you wash yourself, and they wash themselves. What Czech does distinguish is not person but case: the accusative form se and the dative form si. Getting these two straight is one of the highest-value things you can do at A2, because they appear in dozens of the most common verbs you will ever use.

One pronoun, every person

Because Czech verbs already mark the person through their endings, the reflexive pronoun does not need to. Watch how se stays completely unchanged while the verb does all the work:

This is genuinely strange for an English speaker, who expects the reflexive to track the subject. In Czech the subject is already obvious from myju versus myješ, so a single invariable se is all you need. The pronoun never agrees in gender or number either — Petr se umyl and Petra se umyla both use the same se.

se — the accusative reflexive

se is the accusative form. It marks the situation where the subject does something to itself — the subject and the direct object are the same person:

But by far the most important job of se is to mark inherently reflexive verbs — verbs that simply come with se attached as part of the dictionary entry, even when nothing is literally being done "to oneself." You do not analyse them; you memorise them with their se. The big A2 ones include bát se (to be afraid), dívat se (to watch/look), smát se (to laugh), ptát se (to ask), těšit se (to look forward), vrátit se (to return), učit se (to learn), stát se (to happen).

There is nothing reflexive about being afraid in any logical sense — but bát se simply is not a word without its se. Leaving it off (bojím on its own) is not just unidiomatic, it is ungrammatical, the way English I'm afraid cannot drop the am.

si — the dative reflexive

si is the dative form, and its core meaning is for oneself / to oneself: the subject does something and is also the beneficiary or recipient of it. Where se answers whom? (accusative), si answers for whom? / to whom? (dative).

A very common and very Czech use of si is with body parts and personal possessions, where English would use a possessive (my hands, my teeth). Czech marks the "mine-ness" with the dative reflexive instead:

Notice the contrast directly: myju se = I wash myself (whole body, accusative), but myju si ruce = I wash my hands (the hands are the accusative object, and si says they are mine). The choice of se versus si is not random decoration — it tracks whether the reflexive slot is the direct object or the indirect/benefactive one.

When si changes the meaning of the verb

Here is where se versus si stops being grammar and starts being vocabulary. Some verbs exist in both a plain form and a si-form, and the si adds a flavour of doing it for one's own benefit, pleasure, or leisure. The two are genuinely different verbs:

The separate verb učit se versus učit is the cleanest illustration of how the reflexive flips the meaning. Učit se (reflexive) means to learn — the subject teaches itself. Učit (no reflexive) means to teach — the subject teaches someone else:

Where se and si sit in the sentence

Both se and si are clitics — unstressed little words that lock into second position in the clause, right after the first stressed element, and never at the very start. When there is also a past-tense or conditional auxiliary, the auxiliary comes first and the reflexive follows it:

You never say Se bojím or Si koupil jsem. The fuller rules — including the order when both a dative and an accusative pronoun pile up — live on the clitic order page. For the emphatic and prepositional long forms sebe / sobě, see the declension of the reflexive.

Common Mistakes

Key Takeaways

• Czech has one reflexive pronoun for all persons and genders; only the case varies: accusative se, dative si.
• se = the subject acts on itself, and it is the obligatory marker of inherently reflexive verbs (bát se, dívat se, smát se).
• si = for/to oneself; it appears with a separate direct object, especially body parts (myju si ruce) and things you get for yourself (dám si, koupím si).
• Swapping se for si can change the verb entirely: učit se (learn) vs učit (teach), hrát (play a match) vs hrát si (play with toys).
• Both are second-position clitics: they follow any auxiliary and never start the clause.