General Missing:
* Manquer: This is the most common and general way to say "missing". It can be used for people, things, or even feelings.
* Être manquant: This means "to be missing" and is used when something is physically absent.
Missing Someone:
* Me manquer: This literally translates to "to miss me" but is used to say "I miss you".
* Manquer à quelqu'un: This means "to miss someone".
* Ressentir l'absence de quelqu'un: This is a more formal way of saying "to feel someone's absence".
Missing Something:
* Manquer de quelque chose: This means "to lack something".
* Être absent de quelque chose: This means "to be absent from something".
Here are some examples:
* Je te manque? (Do you miss me?)
* Il me manque beaucoup. (I miss him a lot.)
* Je manque de temps. (I lack time.)
* Le livre est manquant. (The book is missing.)
The best translation will depend on the specific context of what you are trying to say.