Formal:
* Je me sens (pronounced "zhuh muh sahn") - This is the most common and general way to say "I feel."
* Je ressens (pronounced "zhuh ruh-sahn") - This is slightly more formal and emphasizes the feeling itself.
Informal:
* Je suis (pronounced "zhuh swee") - This means "I am" and is used when describing a feeling as a state of being. For example, "Je suis triste" (I am sad).
Examples:
* Je me sens bien. (I feel good.)
* Je me sens fatigué. (I feel tired.)
* Je ressens de la joie. (I feel joy.)
* Je suis heureux. (I am happy.)
Note: You can also use different verbs to express specific feelings:
* Avoir peur (to be afraid)
* Avoir froid (to be cold)
* Avoir faim (to be hungry)
* Avoir sommeil (to be sleepy)