Perfect Aspect (Ti) in Yoruba

Overview

The perfect aspect marker "ti" indicates that an action has been completed and has relevance to the present moment. At the A2 level, mastering "ti" alongside the progressive "ń" gives you the ability to express two of the most important aspectual distinctions in Yoruba: what is happening now versus what has already happened. "Mo ti jẹun" (I have eaten) communicates not just that eating occurred but that it is currently relevant -- perhaps you are no longer hungry.

The marker "ti" is placed between the subject and the verb, following the same positional pattern as "ń": Subject + ti + Verb. It corresponds roughly to the English present perfect ("have done") but is used more broadly. It can also combine with other aspect markers to create complex temporal meanings, such as "ti ń" (had been doing) or "kò tíì" (has not yet).

Understanding "ti" is essential for narratives, where you need to distinguish between events that are already completed versus those still in progress. It also appears in the extremely common greeting exchange: "Ṣé o ti jẹun?" (Have you eaten?) -- a phrase you will encounter daily. The negative form "kò tíì" (has not yet) is equally useful for expressing that expected actions have not yet occurred.

How It Works

Pattern: Subject + ti + Verb (+ Object)

Positive	Negative	Meaning
Mo ti lọ.	Mi ò tíì lọ.	I have gone. / I have not yet gone.
Ó ti dé.	Kò tíì dé.	He/She has arrived. / has not yet arrived.
Wọ́n ti ṣe é.	Wọ́n kò tíì ṣe é.	They have done it. / have not yet done it.

Combinations with other markers:

Combination	Meaning	Example
ti + verb	completed with present relevance	Mo ti jẹun. (I have eaten.)
ti ń + verb	had been doing (past progressive)	Mo ti ń ṣe é. (I had been doing it.)
kò tíì	has not yet	Kò tíì dé. (Has not yet arrived.)

Examples in Context

Yoruba	English	Note
Mo ti jẹun.	I have eaten.	Basic perfect
Ó ti lọ.	He/She has gone.	Departure completed
A ti parí iṣẹ́ náà.	We have finished the work.	Completion
Ṣé o ti gbọ́?	Have you heard?	Question with ti
Wọ́n ti kọ ilé náà.	They have built the house.	Completed project
Kò tíì dé.	He/She has not yet arrived.	Negative perfect
Mo ti mọ̀.	I already know.	Prior knowledge
Ó ti di pé...	It has become that...	State change
Oúnjẹ ti ṣetán.	The food is ready. (has become ready)	Resultative
Ṣé o ti rí i?	Have you seen it?	Checking experience

Common Mistakes

Confusing ti (perfect) with ti (from/since)

• Wrong: Interpreting "ti" as always meaning "from" or "since."
• Right: In aspect position (between subject and verb), "ti" is the perfect marker.
• Why: "Ti" has multiple functions in Yoruba. Its position in the sentence determines its function.

Using ti for Simple Past

• Wrong: Mo ti lọ lánàá. (I have gone yesterday.) for a simple past narration.
• Right: Mo lọ lánàá. (I went yesterday.) -- simple past needs no marker.
• Why: "Ti" implies present relevance, not just past action. For simple narration of past events, use the bare verb.

Forming the Negative Incorrectly

• Wrong: Mo kò ti jẹun. (wrong word order for negation)
• Right: Mi ò tíì jẹun. (I have not yet eaten.)
• Why: The negative perfect uses "kò tíì" or "ò tíì" with the adjusted pronoun forms, not simply "kò ti."

Usage Notes

The distinction between simple past (bare verb) and perfect (ti) is important in Yoruba. While English speakers may use them interchangeably, Yoruba speakers select ti specifically when the completed action has bearing on the current situation. "Mo jẹun" (I ate) is a factual statement, while "Mo ti jẹun" (I have eaten) implies "so I am not hungry now" or "so I don't need food."

Practice Tips

1. Practice the greeting exchange: "Ṣé o ti jẹun?" (Have you eaten?) is the most common use of ti. Practice both asking and answering: "Bẹ́ẹ̀ni, mo ti jẹun" (Yes, I have eaten).
2. Contrast bare verb and ti sentences: Practice pairs: "Mo lọ" (I went) vs. "Mo ti lọ" (I have gone). Feel the difference in implication.
3. Learn kò tíì: The "not yet" construction is extremely useful. Practice with common verbs: "Kò tíì dé" (hasn't arrived yet), "Mi ò tíì jẹun" (I haven't eaten yet).

Related Concepts

• Prerequisite: Progressive Aspect (Ń) -- understand aspect markers before adding ti
• Next steps: Complex Aspect Combinations -- combine ti with other markers