Být (to Be) in Czech

In Brief

The Czech verb být means “to be.” Its present-tense forms are jsem, jsi, je, jsme, jste, jsou, and its negative forms are nejsem, nejsi, není, nejsme, nejste, nejsou. Czech often leaves out subject pronouns, so Jsem doma is a complete sentence meaning “I am at home.”

Overview

Být is one of the essential verbs introduced at A1. It lets you say who someone is, describe a person or thing, and give a location: Eva je studentka (“Eva is a student”), Čaj je horký (“The tea is hot”), and Jsme v Praze (“We are in Prague”). You will also meet it in questions such as Kde jsi? (“Where are you?”) and in the past: Byli jsme doma (“We were at home”).

English and Czech both use “be” for identity, descriptions, and location, but the two languages package the information differently. English normally requires an explicit subject—“I am,” “she is”—whereas Czech verb forms usually make the subject clear by themselves. Jsem unavený or Jsem unavená already tells the listener “I am tired”; the adjective ending can also indicate the speaker’s gender.

Two other differences matter from the start. Czech has no articles corresponding directly to English “a” and “the,” so Jsem učitel simply means “I am a teacher.” In addition, Czech adjectives change to agree with the gender and number of the person or thing they describe. These features make být a useful meeting point for several basic parts of Czech grammar.

How It Works

Present-tense forms

The infinitive (the dictionary form, equivalent to English “to ...”) is být. Its present tense is irregular and is best learned as one complete set.

Person	Subject pronoun	Affirmative	Negative	Basic meaning
1st person singular	já	jsem	nejsem	I am / I am not
2nd person singular, informal	ty	jsi	nejsi	you are / you are not
3rd person singular	on, ona, ono	je	není	he, she, it is / is not
1st person plural	my	jsme	nejsme	we are / we are not
2nd person plural or polite	vy	jste	nejste	you are / you are not
3rd person plural	oni, ony, ona	jsou	nejsou	they are / they are not

A subject is the person or thing the sentence is about. Czech often omits a subject pronoun when the verb or context identifies it:

• Jsem v práci. — I am at work.
• Jsi z Londýna? — Are you from London?
• Jsme připraveni. — We are ready.

Adding já, ty, my, or another pronoun is not wrong. It usually creates emphasis or contrast:

• Já jsem doma, ale Petr je v práci. — I am at home, but Petr is at work.
• Ty jsi nový student? — Are you the new student?

Unlike English, Czech does not contract these forms into equivalents of “I’m” or “they’re” in standard spelling. Write jsem, not a shortened form.

Identity, description, and location

A noun is a word naming a person, place, thing, or idea, such as student (“student”). An adjective is a describing word, such as unavený (“tired”). The following sentence patterns cover most beginner uses of být.

Use	Pattern	Czech	English
identity or profession	subject + být + noun	Lenka je lékařka.	Lenka is a doctor.
description	subject + být + adjective	Polévka je teplá.	The soup is warm.
location	subject + být + place expression	Klíče jsou na stole.	The keys are on the table.
origin	subject + být + z + place	Jsem z Irska.	I am from Ireland.
identification with to	to + být + noun	To je moje sestra.	That is my sister.

Czech has no indefinite article, so a profession normally stands alone: Je programátor (“He is a programmer”), not a phrase with a Czech equivalent of “a.” Whether an English translation needs “a” or “the” comes from context.

Adjective agreement

An adjective after být normally agrees with its subject. Agreement means that the adjective ending changes to match grammatical gender and number. At the beginner level, the singular forms are the most important:

Subject type	Form of “tired”	Example	English
masculine singular	unavený	Tomáš je unavený.	Tomáš is tired.
feminine singular	unavená	Ona je unavená.	She is tired.
neuter singular	unavené	Dítě je unavené.	The child is tired.
masculine animate plural	unavení	Studenti jsou unavení.	The students are tired.
feminine or masculine inanimate plural	unavené	Studentky jsou unavené.	The female students are tired.

When speaking about yourself, choose the form that describes you: a man normally says Jsem unavený, while a woman normally says Jsem unavená. The verb jsem does not change; the adjective does.

The pronoun to behaves as neuter singular when followed by an adjective:

• To je dobré. — That is good.
• Je to studené. — It is cold.

If you name a feminine noun instead, the adjective becomes feminine: Káva je studená (“The coffee is cold”).

Making a negative sentence

The negative forms are written as single words. Most begin transparently with ne-, but je changes to není, not neje.

• Nejsem student. — I am not a student.
• Marie není doma. — Marie is not at home.
• Nejsou připravení. — They are not ready.

Czech also uses a negative verb with words such as nikdo (“nobody”) and nic (“nothing”). English usually needs only one grammatical negative, but standard Czech uses both:

• Nikdo tu není. — Nobody is here.
• Nic není hotové. — Nothing is ready.

For past negation, attach ne- to the past form: nebyl jsem (“I was not”), nebyla (“she was not”), nebyli jsme (“we were not”). Do not replace the auxiliary with a present negative form.

Asking questions

Czech does not add an auxiliary equivalent to English “do,” and it does not require a special inversion of subject and verb. A yes/no question can have the same word order as a statement, with question intonation in speech and a question mark in writing:

• Jsi doma? — Are you at home?
• Je Pavel nemocný? — Is Pavel ill?
• Jsou děti ve škole? — Are the children at school?

Question words go where they fit naturally:

• Kde jste? — Where are you?
• Kdo je to? — Who is that?
• Co je to? — What is that?
• Jaký je hotel? — What is the hotel like?

Jste serves two jobs: plural “you are” and polite singular “you are.” When addressing one person formally, the adjective can show that person’s actual gender: Jste připravený? to a man and Jste připravená? to a woman. When addressing a group, use the appropriate plural adjective, for example Jste připraveni? for men or a mixed group.

The basic past tense

The past of být uses forms based on byl. This is an l-participle (a past form ending in -l or one of its agreeing endings). It changes for gender and number. In the 1st and 2nd persons, it is accompanied by jsem, jsi, jsme, or jste; the 3rd person has no such auxiliary.

Subject	Past form	Meaning
já, male speaker	byl jsem	I was
já, female speaker	byla jsem	I was
ty, male addressee	byl jsi	you were
ty, female addressee	byla jsi	you were
on / ona / ono	byl / byla / bylo	he / she / it was
my, men or mixed-gender people	byli jsme	we were
my, all female	byly jsme	we were
vy, men or mixed-gender people	byli jste	you were
vy, all female	byly jste	you were
polite singular, male / female	byl jste / byla jste	you were
oni / ony / ona	byli / byly / byla	they were

Neuter plural subjects use byla, as in Města byla tichá (“The towns were quiet”). At A1, concentrate first on forms that you need for yourself and the people around you.

Notice the difference between persons:

• Byl jsem doma. — I was at home.
• Byla jsi v práci. — You were at work. (to a woman)
• Petr byl doma. — Petr was at home.
• Oni byli v práci. — They were at work.

There is no present je in the third-person past. Petr je byl doma is not Czech.

Examples in Context

Czech	English	Note
Jsem učitel.	I am a teacher.	A profession without an article.
Jsem z Kanady.	I am from Canada.	The subject pronoun is unnecessary.
Ona je unavená.	She is tired.	The adjective is feminine singular.
Je to studené.	It is cold.	to takes a neuter singular adjective.
To je náš nový byt.	That is our new apartment.	Identification with to je.
Káva není horká.	The coffee is not hot.	není is the negative of je.
Dnes nejsme v kanceláři.	We are not in the office today.	Negative 1st person plural.
Jste paní Nováková?	Are you Mrs Nováková?	Polite singular jste.
Kde jsou moje brýle?	Where are my glasses?	A plural subject takes jsou.
Ty jsi ale rychlý!	You really are fast!	ty adds emphasis.
Nikdo tu není.	Nobody is here.	Czech uses a negative word and verb together.
Byl jsem včera v Brně.	I was in Brno yesterday.	Male speaker.
Byla jsem celý den doma.	I was at home all day.	Female speaker.
Byli jsme doma.	We were at home.	1st person plural past.
Děti byly unavené.	The children were tired.	Plural past form and adjective agreement.

Common Mistakes

Using the infinitive without its long vowel

• Wrong: Chci byt doma.
• Right: Chci být doma.
• Why: The infinitive is být, with long ý. Czech diacritics are part of the spelling; byt is a different word meaning “apartment.”

Building the negative of je mechanically

• Wrong: Petr neje doma.
• Right: Petr není doma.
• Why: “Is not” is the irregular form není. Learn je / není as a pair.

Keeping the English subject pronoun in every sentence

• Awkward in a neutral context: Já jsem doma. Já jsem unavený. Já nejsem nemocný.
• More natural: Jsem doma. Jsem unavený. Nejsem nemocný.
• Why: Czech normally omits pronouns when the verb and context make the subject obvious. Keep já when contrasting yourself with someone else or stressing “I.”

Forgetting agreement after být

• Wrong: Ona je unavený.
• Right: Ona je unavená.
• Why: unavený is masculine singular, while a feminine subject requires unavená.

Copying English articles into Czech

• Wrong: Jsem jeden student. when you only mean “I am a student.”
• Right: Jsem student.
• Why: Czech has no indefinite article. Jeden means the number “one” and should be used only when that number matters.

Treating every past form like the third person

• Wrong: Včera já byl doma. in standard neutral Czech.
• Right: Včera jsem byl doma. / Včera jsem byla doma.
• Why: The 1st person needs jsem. Only the 3rd person lacks this auxiliary: Petr byl doma, Eva byla doma.

Usage Notes

Informal ty and polite vy

Use jsi with one person you address as ty: friends, family, children, and people with whom informal address has been established. Use jste for multiple people and for one person addressed politely as vy. In letters and messages, Czech writers may capitalize polite Vy, Vás, Váš to show respect, but the verb remains jste.

English “you” does not reveal this social distinction, so choose the Czech form from the relationship, not from the English sentence alone. In an unfamiliar service or professional situation, Jste... ? is usually the safer starting point.

Word order and emphasis

A safe neutral order is subject + verb + description: Petr je doma. Czech word order is more flexible than English because endings carry much of the grammatical information. Moving an item can change what sounds new or emphasized:

• Petr je doma. — Petr is at home. (neutral)
• Doma je Petr. — Petr is the one at home. / It is Petr who is at home.
• Já jsem doma. — I am at home (perhaps someone else is not).

Beginners do not need to imitate every variation. Start with neutral order and learn marked orders from context rather than assuming that all arrangements mean exactly the same thing.

To je and je to

Both orders are common, but they often fit different contexts. To je moje kniha identifies something: “That is my book.” Je to moje kniha? naturally asks “Is it my book?” The sequence je to also begins many evaluations: Je to dobré (“It is good”). Czech to can correspond to English “it,” “this,” or “that”; the situation supplies the exact meaning.

Beyond the Basics / Advanced Use

You do not need to master the following points at A1, but they explain forms that appear frequently later.

Future forms

The future of být has another irregular set:

Person	Czech	English
já	budu	I will be
ty	budeš	you will be
on, ona, ono	bude	he, she, it will be
my	budeme	we will be
vy	budete	you will be
oni, ony, ona	budou	they will be

For example, Zítra budu doma means “I will be at home tomorrow.” These forms later also help build the future of many imperfective verbs: Budu pracovat (“I will be working / I will work”).

The past auxiliary as a clitic

In Byl jsem doma, the auxiliary jsem is a clitic (a short unstressed word that prefers a fixed position in the clause). It usually appears near the beginning, often after the first meaningful unit: Včera jsem byl doma (“Yesterday I was at home”), not normally Včera byl jsem doma. This positioning becomes important when several short pronouns and auxiliaries occur together.

Nouns in the nominative or instrumental

A noun after být often appears in the nominative case (the basic form commonly used for the subject): Petr je učitel. You may also encounter the instrumental case (a form used for several relationships, including some roles): Petr je učitelem. The instrumental can sound more formal or present the noun as a role, function, or classification. For ordinary A1 identification, the nominative pattern is a reliable choice.

Omitted forms of být

Standard Czech normally keeps present být in complete descriptive sentences: Petr je unavený. However, the verb may disappear in headlines, labels, notes, slogans, and compact proverbial styles, where brevity is expected. Do not generalize this into an English-style rule that je can always be dropped.

A building block for later grammar

Forms of být recur throughout the language. Czech past tenses use jsem, jsi, jsme, jste with l-participles such as pracoval jsem (“I worked”). Passive constructions can use být with a passive participle (a form describing something that receives an action): Dopis byl napsán (“The letter was written”). It also appears in impersonal expressions such as Je možné... (“It is possible...”) and existential sentences such as Na stole je kniha (“There is a book on the table”). These are separate patterns worth learning in their own right.

Practice Tips

1. Learn affirmative and negative forms together. Recite jsem—nejsem, jsi—nejsi, je—není, jsme—nejsme, jste—nejste, jsou—nejsou, then make one true sentence with each form.
2. Build a personal mini-profile. Say where you are from, where you are now, what your role is, and how you feel: Jsem z..., Jsem v..., Jsem..., Jsem unavený/unavená. Repeat it without já, then add já only for a deliberate contrast.
3. Change one sentence across gender and time. Start with Petr je unavený, change it to Eva je unavená, then to Petr byl unavený and Eva byla unavená. This practices the verb and agreement as one connected system.

Related Concepts

• Prerequisite: Personal Pronouns — introduces já, ty, on, ona, ono, my, vy, oni, ony, which match the forms of být.
• Next step: Existential Constructions — uses je, jsou, není, and nejsou to express “there is” and “there are.”
• Later topic: Impersonal Constructions — develops expressions such as Je třeba... and Je možné..., where English often uses impersonal “it.”