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1.  These two are opposite/antonyms, and you can easily tell from English meaning.


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2. If you want to state what belongs or related to you, you can use this character.
e.g. 我的朋友(我朋友),我的媽媽(我媽媽),李安琳的兄弟姐妹,Oscar的家⋯

From the examples, you see you can omit 的 when it is used with pronoun (my/your/his/their, etc.). But you can't omit it when it is used with noun (name).

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3. It shows a plural form for people.
e.g. 人們,我們,他們,姐姐們,老師們⋯




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