Purpose Clauses with Kí and Láti in Yoruba

In Brief

Use láti + verb when the purpose is presented as an action, usually with the same understood subject: Mo wá láti kọ́ èdè Yorùbá (“I came to learn Yoruba”). Use kí + subject + verb when you need a full purpose clause, especially when its subject is stated or differs from the subject of the main clause: Mo ṣí ilẹ̀kùn kí wọ́n lè wọlé (“I opened the door so that they could come in”). Lè often adds the idea “can/may/be able to.”

Overview

A purpose clause tells us the goal of an action: why someone comes, works, saves money, opens a door, or gives an instruction. English commonly uses “to,” “in order to,” and “so that.” Yoruba has two central ways to express these meanings: láti before a verb phrase and kí before a clause.

This contrast becomes especially useful at B1, when sentences begin to contain more than one action or participant. The basic choice is practical rather than mysterious. Láti introduces a purpose as an action; kí introduces a clause with its own subject (the person or thing that performs the action). A clause simply means a group of words built around a verb, often with a subject of its own.

The two patterns can overlap in meaning, but they are not interchangeable word for word. English “to” is not always láti, and English “so that” is not always followed by an equivalent of “will.” Learning the complete Yoruba patterns will produce more natural sentences than translating each English word separately.

How It Works

1. Láti + verb phrase: “in order to”

The compact pattern is:

main clause + láti + verb (+ complements)

A verb phrase is the verb together with anything that completes it, such as an object or destination.

• Mo wá láti kọ́ èdè Yorùbá. — I came to learn Yoruba.
• A ṣe é láti ran wọ́n lọ́wọ́. — We did it to help them.
• Ó ń kó owó jọ láti ra ọkọ̀. — He/She is saving money to buy a car.

No separate pronoun normally appears immediately after láti in this pattern. The person who carries out the purpose is understood from the sentence. Most often, it is the subject of the main verb: in Mo wá láti kọ́, the same “I” both came and intended to learn.

English also leaves the subject unspoken in “I came to learn.” That similarity makes láti a useful first choice when the subject remains the same. However, learn láti as part of a Yoruba construction, not as an automatic replacement for every English infinitive marker “to.”

2. Kí + subject + verb: “so that”

When the purpose is a full clause, use:

main clause + kí + subject + verb (+ complements)

• Mo ṣí ilẹ̀kùn kí wọ́n wọlé. — I opened the door so that they could come in.
• Ó pè mí kí n ran án lọ́wọ́. — He/She called me so that I would help him/her.

The subject after kí must match the intended performer of the purpose action. Notice that this need not be the subject of the main clause. In the second example, ó made the call, but n (“I”) is to provide the help.

Common subject forms after kí are shown below. Tone marks matter in careful writing.

Meaning	Form after kí	Short example
I	kí n	kí n lè kọ́ — so that I can learn
you (singular)	kí o	kí o lè rí i — so that you can see it
he/she/it	kí ó	kí ó lè lọ — so that he/she can go
we	kí a	kí a lè bẹ̀rẹ̀ — so that we can begin
you (plural/respectful)	kí ẹ	kí ẹ lè wọlé — so that you can enter
they	kí wọ́n	kí wọ́n lè gbọ́ — so that they can hear

The spelling distinction between kí o (“so that you…”) and kí ó (“so that he/she/it…”) is especially important. In speech, tone and context help identify the intended subject; in writing, preserve the tone mark on ó.

3. Adding lè: purpose plus possibility or ability

A very common expanded pattern is:

main clause + kí + subject + lè + verb

Here lè contributes “can,” “may,” or “be able to.” It presents the main action as creating the conditions that make the desired result possible.

• Ó ṣiṣẹ́ kí ó lè jẹun. — He/She works so that he/she can eat.
• Ṣe dáadáa kí o lè borí. — Do well so that you may succeed.
• Sọ̀rọ̀ sókè kí a lè gbọ́ ọ. — Speak up so that we can hear you.

Do not treat lè as an obligatory part of every kí purpose clause. Compare:

• Mo pè é kí ó wá. — I called him/her to come.
• Mo kọ ọ́ sílẹ̀ kí ó lè rántí. — I wrote it down so that he/she could remember.

The first simply states the intended action. The second emphasizes being enabled to remember. English translations often use “could,” “would,” or just “to,” depending on the context; Yoruba does not need to copy the English tense word for word.

4. Choosing between láti and kí

Intended structure	Yoruba pattern	Best used when
“I came to learn”	Mo wá láti kọ́	The purpose is compact and its performer is understood, usually the main subject.
“I opened it so that they could enter”	Mo ṣí i kí wọ́n lè wọlé	The purpose needs an explicit subject, especially a different one.
“Do it so that it will be good”	Ṣe é kí ó lè dára	The result or desired state has its own subject.

A useful test is to ask: Who performs the purpose action? If that person is simply the main subject and does not need to be repeated, láti is often natural. If you need to name or contrast the performer, use kí and state the subject.

This is a strong learner rule, not an absolute claim that every same-subject purpose must use láti. Yoruba can use a kí clause with the same subject when the speaker chooses to frame the purpose as a full desired action, especially with lè. The difference is then one of packaging and emphasis, not merely identity of subject.

Examples in Context

Yoruba	English	Note
Mo wá láti kọ́ èdè Yorùbá.	I came in order to learn Yoruba.	Láti with the same understood subject.
A ṣe é láti ran wọ́n lọ́wọ́.	We did it in order to help them.	The purpose is a compact verb phrase.
Ó ń kó owó jọ láti ra ọkọ̀.	He/She is saving money to buy a car.	A planned goal.
Wọ́n lọ sí ọjà láti ra oúnjẹ.	They went to the market to buy food.	Purpose of movement.
Mo ń kẹ́kọ̀ọ́ láti ṣe àṣeyọrí.	I am studying in order to succeed.	The subject remains “I.”
Ó ṣiṣẹ́ kí ó lè jẹun.	He/She works so that he/she can eat.	Lè presents eating as enabled.
Ṣe dáadáa kí o lè borí.	Do well so that you may succeed.	A command followed by its intended result.
Mo ṣí ilẹ̀kùn kí wọ́n lè wọlé.	I opened the door so that they could come in.	The two clauses have different subjects.
Sọ̀rọ̀ sókè kí a lè gbọ́ ọ.	Speak up so that we can hear you.	A is the subject of the purpose clause.
Ó fún mi ní ìwé kí n lè kà á.	He/She gave me a book so that I could read it.	N marks “I” after kí.
Mo kọ ọ́ sílẹ̀ kí ó lè rántí.	I wrote it down so that he/she could remember.	The writing makes remembering possible.
Ẹ tètè dé kí ẹ lè rí àyè.	Arrive early so that you can find a place.	Plural or respectful ẹ occurs in both clauses.
Mo pè é kí ó wá.	I called him/her to come.	A kí clause without lè.

Common Mistakes

Using láti when the purpose has a different subject

• Wrong: Mo ṣí ilẹ̀kùn láti wọ́n wọlé.
• Right: Mo ṣí ilẹ̀kùn kí wọ́n lè wọlé.
• Why: Láti does not take a separately stated subject in this compact purpose pattern. Use kí + wọ́n because “they,” not “I,” are to enter.

Leaving out the subject after kí

• Wrong: Mo ṣí ilẹ̀kùn kí lè wọlé.
• Right: Mo ṣí ilẹ̀kùn kí wọ́n lè wọlé.
• Why: A kí purpose clause needs a subject. State who can enter.

Confusing kí o and kí ó

• Wrong: Ṣe dáadáa kí ó lè borí. (when speaking to one person and meaning “you”)
• Right: Ṣe dáadáa kí o lè borí.
• Why: O is singular “you”; ó is “he/she/it.” The tone mark changes the meaning.

Treating lè as mandatory

• Wrong assumption: Every purpose clause must contain lè.
• Natural: Mo pè é kí ó wá. — I called him/her to come.
• Also natural with a different nuance: Sọ̀rọ̀ sókè kí a lè gbọ́ ọ. — Speak up so that we can hear you.
• Why: Lè adds possibility or ability. Use it when “can/may/be able to” belongs in the intended meaning.

Translating English “to” mechanically

• Poor strategy: choosing láti whenever the English translation contains “to.”
• Better: first decide whether the Yoruba sentence needs a compact purpose phrase or a full clause with its own subject.
• Why: English “to” has many jobs besides expressing purpose. Meaning and sentence structure must guide the Yoruba choice.

Usage Notes

Both láti and kí are normal in everyday and more formal Yoruba. The important register issue is not that one is inherently “formal,” but that a longer kí ... lè ... clause can make the participants and intended possibility more explicit. This clarity is useful in instructions, explanations, plans, and advice.

Yoruba pronouns and tone marks carry information that English often leaves to context. Write kí, ó, lè, and other marked forms carefully when producing standard written Yoruba. Informal digital writing may omit diacritics, but learners should not use that as a model: kí o and kí ó are much easier to distinguish when tones are shown.

The word láti also occurs with meanings that are not purpose, including “from” in expressions of origin or starting point. Context identifies its job. When láti is directly followed by an action and answers “for what purpose?”, the purpose reading is likely: Ó wá láti ṣiṣẹ́ (“He/She came to work”). Do not assume every occurrence of láti means “in order to.”

Beyond the Basics / Advanced Use

Negative purpose: preventing an unwanted result

To express “so that … not” or “lest,” Yoruba commonly uses a negative kí clause. One important pattern contains má bàa, presenting an unwanted possibility that the main action is meant to prevent:

• Mo kọ ọ́ sílẹ̀ kí n má bàa gbàgbé. — I wrote it down so that I would not forget.
• Ó tètè dé kí ó má bàa pé. — He/She arrived early so as not to be late.

This deserves to be learned as a whole pattern rather than built by placing an English “not” into a positive sentence. In careful study, pay attention to the subject after kí and to the fixed sequence má bàa.

Same subject with different framing

The same person can appear in both clauses with kí, particularly when the desired outcome, ability, or possibility is prominent:

• Ó ń ṣiṣẹ́ kí ó lè jẹun. — He/She works so that he/she can eat.

A compact láti phrase would foreground the goal as an action; kí ó lè explicitly frames it as something the subject should be able to do. The exact English translation may hide this distinction, so compare Yoruba structures directly rather than relying only on translations.

Purpose and result are not identical

A purpose is intended; it is not necessarily achieved. “I opened the door so that they could enter” reports why I opened it, but does not by itself say that they entered. This distinction helps when reading narratives: a kí clause may name the desired outcome, while a later clause tells whether it actually happened.

Also avoid assuming that every second verb expresses purpose. Yoruba frequently places verbs in sequence, and such serial verb constructions can express movement, manner, instrument, or a tightly linked event. Ask whether the later action answers “Why was the first action done?” If it does, a purpose analysis is plausible. If it tells how, where, or by what means the event happened, another construction may be involved.

Practice Tips

1. Use the “who does it?” test. Write five English purpose sentences. Underline the performer of each action, then choose láti for a compact same-subject goal or kí + subject when the performer must be stated.
2. Build a six-person kí drill. Repeat one useful frame with kí n, kí o, kí ó, kí a, kí ẹ, and kí wọ́n: for example, ... kí ___ lè wọlé. This makes subject choice automatic and reinforces the tone contrast between o and ó.
3. Compare meaning with and without lè. Collect pairs such as kí ó wá and kí ó lè wá. Ask whether the sentence merely names the intended action or emphasizes the ability/opportunity to carry it out.

Related Concepts

• Prerequisite: Basic Serial Verb Constructions — helps you distinguish linked Yoruba verbs from an explicitly marked purpose phrase or clause.