Formal:
* 亲爱的妈妈 (qīn'ài de māma): This is the most common and polite way to address your mother in writing. It literally means "beloved mother."
Informal:
* 妈妈 (māma): This is the most common way to address your mother in daily conversation.
* 妈 (mā): This is a more casual and familiar term, often used by children or close family members.
With a specific title:
* 亲爱的妈妈 (qīn'ài de māma): This is a more formal way to address your mother, often used in letters or emails.
* 尊敬的妈妈 (zūn jìng de māma): This is a very formal way to address your mother, often used in official documents or situations.
To write "Dear Mom" as a salutation in a letter, you can use:
* 亲爱的妈妈 (qīn'ài de māma): This is the most common and polite option.
* 妈妈 (māma): This is also acceptable, but slightly less formal.
Ultimately, the best way to say "Dear Mom" in Chinese depends on the specific context and your relationship with your mother.