Formal:
* Mo mọ́: This is the most common and formal way to say "I know."
* Mo ti mọ́: This means "I already know" and implies that you've been aware of something for a while.
Informal:
* Mo mọ́ o: This is a more informal version of "Mo mọ́" and is often used in everyday conversation.
* Mo ń mọ́: This means "I am aware of" and is used when you are acknowledging something you didn't know before.
Examples:
* Mo mọ́ pé o ní ọjọ́ ìbí ní ọjọ́ Ìṣẹ́gun: I know your birthday is on Independence Day.
* Mo ti mọ́ pé o ní ẹ̀rí ìwà-bí-eniyan: I already know you are a good person.
* Mo mọ́ o pé ó yẹ kí o gbọ́ sí mi: I know you should listen to me.
* Mo ń mọ́ pé o ń gbé ní ilé tuntun: I am aware that you live in a new house.
The best way to choose the right phrase for "I know" in Yoruba depends on your relationship with the person you are talking to and the situation.