Complex Sentences in Ukrainian

In Brief

A Ukrainian complex sentence joins a main clause to a subordinate clause (a clause that depends on another clause), usually with a connector such as що “that,” коли “when,” щоб “so that,” or хоча “although.” Put a comma between the clauses. With який “who/which,” choose gender and number from the noun it refers to, but choose case from the pronoun’s job inside its own clause.

Overview

Complex sentences let you move beyond separate statements and show how ideas relate: what someone knows, when something happens, why an action is done, which person or thing you mean, or what remains true despite a difficulty. At B1, five especially useful connectors are що, який, коли, щоб, and хоча.

A clause is a group of words built around a predicate—usually a verb—and capable of expressing an event, state, or judgment. In Я знаю, що ти маєш рацію (“I know that you are right”), Я знаю is the main clause and що ти маєш рацію depends on it. Ukrainian normally marks this boundary with a comma even where English does not.

The basic logic is familiar to an English speaker, but two differences need attention. First, Ukrainian comma placement is more systematic. Second, a relative pronoun such as який changes form because Ukrainian uses case (a change in a word’s form that shows its role in the sentence). English often uses the same “who” or “which” where Ukrainian uses який, якого, якому, яким, and other forms.

How It Works

The basic clause pattern

The subordinate clause may follow or precede the main clause:

Order	Pattern	Example	Meaning
Main first	main clause, + connector + subordinate clause	Я думаю, що він удома.	I think that he is at home.
Subordinate first	connector + subordinate clause, + main clause	Коли закінчиш, зателефонуй.	When you finish, call.

Ukrainian word order is flexible, but the connector normally stands at or near the beginning of the subordinate clause. A comma separates the clauses. Do not copy English comma habits: Ukrainian writes Я знаю, що…, with a comma before що.

Що: facts, thoughts, and statements

The conjunction що introduces the content of knowing, saying, thinking, noticing, hoping, or similar mental and communicative acts. As a conjunction, it means “that” and does not change form.

• Я знаю, що ти маєш рацію. — “I know that you are right.”
• Вона сказала, що повернеться завтра. — “She said that she would return tomorrow.”
• Ми раді, що ви прийшли. — “We are glad that you came.”

English may omit “that”: “I think he knows.” Standard Ukrainian normally keeps що: Я думаю, що він знає.

Do not confuse conjunction що with interrogative or relative що, meaning “what” or “that which”: Що сталося? (“What happened?”), Усе, що я знаю (“Everything that I know”). The form is the same, but its job differs.

Який: identifying a person or thing

A relative clause adds information about a noun: книга, яку я читаю (“the book that I am reading”). Який behaves like an adjective. It agrees with its antecedent (the noun it points back to) in gender and number, while its case is determined by its role inside the relative clause.

Compare:

Ukrainian	English	Why this form?
Чоловік, який живе тут	The man who lives here	Masculine singular; який is the subject, so nominative.
Жінка, яку я знаю	The woman whom I know	Feminine singular; she is the direct object, so accusative яку.
Друг, якому я пишу	The friend I am writing to	Masculine singular; писати комусь takes the dative, so якому.
Дім, у якому ми живемо	The house in which we live	Masculine singular; у for location takes the locative, so якому.
Люди, з якими вона працює	The people she works with	Plural; з “with” takes the instrumental, so якими.

The crucial method is two-step:

1. Look back to the noun to choose gender and number.
2. Look inside the relative clause to choose case.

A preposition stays with the relative pronoun: у якому “in which,” з якою “with whom,” про яких “about whom.” English often moves the preposition to the end (“the person I spoke with”), but Ukrainian does not normally strand it there.

Here are the most useful forms of який. This is a reference table, not a list to memorize in one sitting.

Case and role	Masculine / neuter	Feminine	Plural
Nominative: subject	який / яке	яка	які
Genitive: “of,” after certain prepositions	якого	якої	яких
Dative: recipient	якому	якій	яким
Accusative: direct object	який/якого; яке	яку	які/яких
Instrumental: “with/by”	яким	якою	якими
Locative: after a location/topic preposition	(у/на) якому	(у/на) якій	(у/на) яких

In the accusative, masculine singular and plural forms follow the usual animate–inanimate distinction. For example, студент, якого я бачу uses якого for an animate man, while фільм, який я дивлюся uses який for an inanimate film.

Коли: questions and time clauses

Коли can be a question word or a conjunction:

• Коли прийдеш? — “When will you come?” (direct question)
• Я не знаю, коли ти прийдеш. — “I do not know when you will come.” (embedded question)
• Коли прийдеш, зателефонуй. — “When you arrive, call.” (time clause)

In a future-time clause, Ukrainian commonly uses a future form where English uses the present: Коли ти прийдеш… literally has “will come,” although idiomatic English says “when you come.” Do not force the English tense pattern onto Ukrainian.

A clause beginning with коли can come first or second. Use the comma in either order: Зателефонуй, коли приїдеш and Коли приїдеш, зателефонуй.

Щоб: purpose, desired results, and requests

For purpose, щоб means “so that” or “in order to.” If the subject of both actions is the same, Ukrainian commonly uses щоб + infinitive (the dictionary form of a verb):

• Вчуся, щоб скласти іспит. — “I am studying to pass the exam.”
• Ми зупинилися, щоб відпочити. — “We stopped to rest.”

If the subjects differ, щоб is followed by a verb form that looks like the past tense and agrees with the subordinate subject in gender or number:

• Я поясню ще раз, щоб ти зрозумів / зрозуміла. — “I will explain once more so that you understand.”
• Вона зачинила вікно, щоб діти не змерзли. — “She closed the window so that the children would not get cold.”

These forms do not necessarily refer to past time. After щоб, they present a desired, intended, or requested action. The same construction appears after expressions of desire, importance, or indirect commands: Хочу, щоб ти прийшов (“I want you to come”); Скажи йому, щоб зачекав (“Tell him to wait”).

Хоча: concession and contrast

Хоча introduces a concession: a fact that might have led you to expect a different result. English equivalents include “although,” “though,” and sometimes “even though.”

• Хоча було пізно, ми продовжували працювати. — “Although it was late, we kept working.”
• Вона пішла на прогулянку, хоча йшов дощ. — “She went for a walk although it was raining.”

Do not add але automatically to the main clause. Хоча було холодно, ми вийшли is complete. In speech and writing, але may occur for emphasis—Хоча було холодно, але ми вийшли—but the simpler version is a safer neutral model.

Examples in Context

Ukrainian	English	Note
Я знаю, що ти маєш рацію.	I know that you are right.	що introduces known information.
Олена написала, що запізниться.	Olena wrote that she would be late.	Content of a message.
Ми раді, що все вдалося.	We are glad that everything worked out.	що follows an emotion.
Це лікарка, яка мені допомогла.	This is the doctor who helped me.	Feminine subject: яка.
Де книга, яку ти купив?	Where is the book that you bought?	Feminine direct object: яку.
Я зустрів колегу, з яким працював торік.	I met the colleague I worked with last year.	з + instrumental яким.
Це місто, у якому я народилася.	This is the city where I was born.	Neuter antecedent; locative якому.
Коли матимеш час, напиши мені.	When you have time, write to me.	Future-time clause comes first.
Не пам’ятаю, коли починається зустріч.	I do not remember when the meeting starts.	Embedded question.
Я відкрив файл, щоб перевірити адресу.	I opened the file to check the address.	Same subject, so infinitive.
Говоріть повільніше, щоб усі вас зрозуміли.	Speak more slowly so that everyone understands you.	Different subject: усі.
Хоча автобус запізнився, ми встигли.	Although the bus was late, we made it.	Unexpected result.
Він погодився, хоча мав сумніви.	He agreed, although he had doubts.	Concessive clause comes second.

Common Mistakes

Copying English comma rules

• Wrong: Я думаю що вона вдома.
• Right: Я думаю, що вона вдома.
• Why: Ukrainian separates the main and subordinate clauses with a comma before що.

Choosing the case of який from the antecedent’s role

• Wrong: Це жінка, яка я знаю.
• Right: Це жінка, яку я знаю.
• Why: жінка is nominative in the main clause, but the woman is the direct object of знаю inside the relative clause. Therefore яку is accusative.

Leaving a preposition at the end

• Wrong: Друг, який я говорив з…
• Right: Друг, з яким я говорив…
• Why: Put the preposition before its pronoun: з яким, literally “with whom.”

Dropping що because English can drop “that”

• Wrong: Я думаю, він уже прийшов. (as a neutral learner model)
• Right: Я думаю, що він уже прийшов.
• Why: Spoken context can produce looser structures, but a standard content clause normally uses що.

Using an infinitive when the subjects differ

• Wrong: Я хочу, щоб прийти ти.
• Right: Я хочу, щоб ти прийшов / прийшла.
• Why: With a separate subordinate subject, use щоб + subject + past-form verb, not an infinitive.

Following the English tense after коли

• Wrong: Коли ти приходиш завтра, зателефонуй. (for one future arrival)
• Right: Коли ти прийдеш завтра, зателефонуй.
• Why: Ukrainian normally uses the perfective future прийдеш for this completed future event.

Usage Notes

Ukrainian allows more word-order variation than English because endings identify grammatical roles. Still, neutral subordinate-clause order often places the subject before the verb: що Марія працює, коли вони приїдуть. Move elements mainly for context or emphasis rather than at random.

Commas mark clause structure, not pauses in speech. If a whole subordinate clause comes first, place the comma after it. If it interrupts the main clause as a relative clause, enclose it: Книга, яку ти позичив, лежить на столі. Restrictive and nonrestrictive relative clauses—the English distinction between essential and extra information—do not map neatly onto English comma practice; Ukrainian generally separates a post-noun relative clause with a comma.

In relative clauses, який is the most practical neutral choice for learners. Що can also function as an invariant relative word, especially in common patterns such as усе, що… (“everything that…”). Котрий is another declining relative pronoun; it can sound more bookish or be chosen to avoid repetition. Master який first, then learn these alternatives through reading.

The forms би and б may appear separately in related desired or hypothetical constructions, but щоб is written as one word. Do not analyze every щоб clause as past tense merely because forms such as прийшов resemble the past.

Beyond the Basics / Advanced Use

A sentence can contain several levels of subordination: Я знаю, що ти прочитав книгу, яку я тобі порадив (“I know that you read the book that I recommended to you”). To understand it, find each predicate, then connect each clause to what it depends on: прочитав depends on знаю, while порадив describes книгу.

Connectors also combine into more precise expressions. You will encounter тому що “because,” після того як “after,” перед тим як “before,” незважаючи на те що “despite the fact that,” and paired structures such as не тільки … а й … “not only … but also.” Multiword connectors may have punctuation patterns that depend on emphasis and sentence structure, so learn them as complete examples rather than by inserting commas mechanically between every word.

At higher levels, pay attention to the difference between a connector and a clause member. Conjunction що only links clauses, while relative який has a syntactic role inside its clause and therefore declines. This distinction becomes especially important in formal writing, indirect speech, and sentences with several nested relative clauses.

Ukrainian also uses щоб beyond literal purpose. After важливо “it is important,” потрібно “it is necessary,” хотіти “to want,” or verbs of requesting, it introduces a desired situation: Важливо, щоб усі були готові (“It is important that everyone be ready”). English chooses several different patterns here; Ukrainian unifies many of them with щоб.

Practice Tips

1. Build clause pairs. Start with two short statements—Я знаю. Вона працює тут.—then combine them: Я знаю, що вона працює тут. Repeat with коли, щоб, and хоча.
2. Solve relative pronouns in two steps. Circle the antecedent for gender and number, then ask what the pronoun does inside its clause to choose the case. Practice with one noun across several roles: друг, який…; друг, якого…; друг, якому…; друг, з яким….
3. Mark commas while reading aloud. In a short Ukrainian text, underline each connector, bracket its subordinate clause, and notice where Ukrainian punctuation differs from the English translation.

Related Concepts

• Prerequisite: Reflexive Verbs — strengthens the verb patterns used inside clauses.
• Next step: Relative Pronouns — gives a fuller treatment of який, що, and котрий, including declension.
• Next step: Indirect Speech — develops content clauses for reported statements, questions, and requests.
• Advanced: Complex Sentence Structures — extends these patterns to denser and more stylistically varied sentences.