* Simple: "I'm so happy!"
* Descriptive: "The warm sunshine on my face and the sound of laughter filled me with pure joy."
* Specific: "Getting that promotion made me feel like I could fly!"
* Figurative: "My heart was doing cartwheels with excitement."
* Humorous: "I'm so happy, I could eat a whole cake...and then maybe another one!"
The best way to express happiness in a sentence depends on the context and the level of emotion you want to convey.