Formal:
* Me manquez (à moi) - This literally translates to "you miss (to me)" and is the most direct way to express that someone is missing from you.
* Je ressens votre absence - This means "I feel your absence" and is a more poetic and emotionally charged way to say it.
Informal:
* Tu me manques - This is the most common way to say "you are missing from me" and is used in a casual conversation with friends and family.
* J'ai besoin de toi - This means "I need you" and can be used if you're feeling particularly lonely or missing someone.
* J'ai l'impression que tu me manques - This translates to "I feel like you are missing from me" and is a softer, more indirect way to say it.
The best choice will depend on your relationship with the person you're talking to, the tone you want to set, and the context of the situation.