Formal:
* 親愛的 (chēn'āi) - This is the most common and formal way to say "dear" and is used for people you respect or are not close to.
* 敬愛的 (gìng'āi) - This is also formal and used for people of higher status or authority.
Informal:
* 親愛的 (chēn'āi) - Can also be used informally, but it sounds a bit more formal than the next option.
* 寶貝 (bǒubèi) - This is a more affectionate and casual way to say "dear" and is typically used for close friends, family, or romantic partners.
* 愛人 (ài rén) - This literally means "loved one" and is commonly used for romantic partners.
* 親 (chēn) - This is a shortened version of "親愛的 (chēn'āi)" and is used for close friends and family.
Specific Situations:
* 親愛的 (chēn'āi) - Used for both men and women, this is a common and versatile option for most situations.
* 宝贝 (bǎobei) - Often used for children and is generally seen as very cute and affectionate.
* 亲爱的 (qīn'ài de) - Used for romantic partners, this is a sweet and affectionate way to address your loved one.
It's important to note that the best way to use "dear" in Cantonese depends on the specific context and the relationship you have with the person you are speaking to.
If you are unsure, it's always better to err on the side of formality.