Formal:
* 我喜欢你 (Wǒ xǐhuān nǐ): This is the most literal and formal translation, meaning "I like you." It's appropriate for someone you don't know well or for a more serious situation.
Informal:
* 我喜欢你 (Wǒ xǐhuān nǐ): This is still a common way to say "I like you" in informal situations.
* 我对你有好感 (Wǒ duì nǐ yǒu hǎo gǎn): This means "I have a good feeling about you" and is a more nuanced way to express your liking.
* 我喜欢你 (Wǒ ài nǐ): This means "I love you" and is generally used in a romantic context. Be careful using this phrase unless you are sure of the other person's feelings.
Note: The way you say "I like you" in Mandarin can be affected by your relationship with the person, your age, and the setting. It's always best to choose your words carefully and consider the context.