Formal:
* 我很好 (wǒ hěn hǎo): This is the most common and polite way to say "I am fine." It literally means "I am very good."
* 我挺好的 (wǒ tǐng hǎo de): This is slightly less formal than "我很好" and means "I am pretty good."
Informal:
* 我没事 (wǒ méi shì): This means "I'm okay" or "I'm fine." It's more casual and suitable for friends and family.
* 还好 (hái hǎo): This literally means "still good" and implies that you are doing alright, but not necessarily great. It's a bit more neutral than "我没事."
Other options:
* 我很好 (wǒ hěn hǎo): You can use this phrase to express that you're feeling happy and content.
* 我身体很好 (wǒ shēntǐ hěn hǎo): This specifically means "I'm in good health."
Remember to consider the situation and the person you're talking to when choosing the appropriate phrase.