Formal:
* Ninakukosa: This is the most literal translation and is appropriate for someone you respect, like an elder or teacher.
* Nakukumbuka: This means "I remember you," and implies a longing for the person.
Informal:
* Nakupenda sana: This means "I love you very much" and can be used as an affectionate way to say "miss you."
* Umenikosa: This is a more direct way to say "I miss you," but can be considered a bit strong.
In addition to these, you can also use phrases like:
* Ninahitaji kukuona: This means "I need to see you."
* Natamani uwe hapa: This means "I wish you were here."
Ultimately, the best way to say "miss you" in Swahili depends on your relationship with the person you are speaking to.