Formal:
* 我爱你们 (wǒ ài nǐmen) - This is the most direct and literal translation. It's suitable for formal occasions or when addressing a group of people you don't know very well.
Informal:
* 我爱你们 (wǒ ài nǐmen) - This is also acceptable in informal settings, especially with close friends and family.
* 我爱你们所有人 (wǒ ài nǐmen suǒyǒu rén) - This adds "all" for emphasis and is a more affectionate way of saying it.
* 我爱你们大家 (wǒ ài nǐmen dàjiā) - This also adds "all" and is another common way to express love for a group of people.
Other options:
* 我很爱你们 (wǒ hěn ài nǐmen) - This adds "very" to express stronger feelings.
* 我非常爱你们 (wǒ fēicháng ài nǐmen) - This adds "extremely" for even stronger emotions.
Important Note: While "我爱你 (wǒ ài nǐ)" means "I love you," it's usually used for one person. Using it for a group could feel odd and might be interpreted as "I love you, you, and you."
Ultimately, the best way to say "I love you all" in Chinese depends on the specific situation and your relationship with the people you're addressing.