Those three characters sound the same (de) but do not mean the same and are not used in the same way. Let’s review!
“的” used before a noun
1. To define or show possession and subordination
For example: 他是我的同学
Tā shì wǒ de tóngxué
He is my classmate
2. Usually, when an adjectival phrase (very+ adj.) is used as the attribute
For example: 李老师是很好的老师
Lǐ lǎoshī shì hěn hǎo de lǎoshī
Teacher Li is a very good teacher
This rule has many exceptions and the only way to really know how use this 的 is to listen to a native speaker or teacher.
“的” used at the end of a declarative sentence
For emphasis; can be ” translated” in English as “!”
For example: 我的手机是新的
Wǒ de shǒujī shì xīn de
My cell phone is new
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