<p>的 can be omitted in casual conversations (口語) when used as possessive means - 我的,他的,你的, and when there is no uncertainty on your relationship with the object.</p>
<ul>
<li><p>那是我的家 = 那是我家</p>
</li>
<li><p>他是我的哥哥 = 他是我哥哥</p>
</li>
<li><p>這位是我的老師 = 這位是我老師</p>
</li>
</ul>
<p>However, 的 can't be omitted when the possession of something needs to be ascertained, such as:</p>
<ul>
<li>那是&quot;我的東西&quot;, 那是&quot;我的課本&quot;, 這是&quot;我的狗&quot;, 那是&quot;我父親的愛好&quot;, &quot;我家門口的石獅子&quot;.</li>
</ul>

CC BY-SA 4.0
2021-11-01T02:07:33.790Z
As in “我^家門口的石獅子”，one should say “那是我^課本上的笔记” with the first 的 omitted （marked as ^）
imkzh
CC BY-SA 4.0
2021-11-01T02:46:41.140Z
@imkzh The focus point of your example is "課本上的笔记" not the possession of the textbook by you, so 的 can be omitted. Actually, "那是課本上的笔记" means almost the same, 我 can be a redundant word in this case.
r13
CC BY-SA 4.0
2021-10-31T18:46:39.143Z
2021-10-31T18:46:39.143Z
r13
<p>How to answer this question 这是你弟弟？（朋友）
Is this correct or we should omit 的？“不是。这是我的朋友。”</p>

CC BY-SA 4.0
2021-10-31T12:15:01.213Z
See [To 的 or not to 的](https://chinese.stackexchange.com/questions/32029/to-%e7%9a%84-or-not-to-%e7%9a%84) and [Why there is no 的 after 你 in 你国家的医院好吗?](https://chinese.stackexchange.com/questions/22204/why-there-is-no-%e7%9a%84-after-%e4%bd%a0-in-%e4%bd%a0%e5%9b%bd%e5%ae%b6%e7%9a%84%e5%8c%bb%e9%99%a2%e5%a5%bd%e5%90%97)
Tang Ho
<grammar><usage>
The use of the particle de
# The use of the particle de

(Asked by: username_0 on 2021-10-31)

How to answer this question 这是你弟弟？（朋友）
Is this correct or we should omit 的？“不是。这是我的朋友。”

**Tags:** grammar, usage
> **Comments:**
> **username_1**: See [To 的 or not to 的](https://chinese.stackexchange.com/questions/32029/to-%e7%9a%84-or-not-to-%e7%9a%84) and [Why there is no 的 after 你 in 你国家的医院好吗?](https://chinese.stackexchange.com/questions/22204/why-there-is-no-%e7%9a%84-after-%e4%bd%a0-in-%e4%bd%a0%e5%9b%bd%e5%ae%b6%e7%9a%84%e5%8c%bb%e9%99%a2%e5%a5%bd%e5%90%97)  

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## 1 answers

### Answer by username_2 on 2021-10-31. Score: 1

的 can be omitted in casual conversations (口語) when used as possessive means - 我的,他的,你的, and when there is no uncertainty on your relationship with the object.

* 那是我的家 = 那是我家
* 他是我的哥哥 = 他是我哥哥
* 這位是我的老師 = 這位是我老師

However, 的 can't be omitted when the possession of something needs to be ascertained, such as:

* 那是"我的東西", 那是"我的課本", 這是"我的狗", 那是"我父親的愛好", "我家門口的石獅子".

> **Comments:**
> **username_3**: As in “我^家門口的石獅子”，one should say “那是我^課本上的笔记” with the first 的 omitted （marked as ^）  
> **username_2**: @imkzh The focus point of your example is "課本上的笔记" not the possession of the textbook by you, so 的 can be omitted. Actually, "那是課本上的笔记" means almost the same, 我 can be a redundant word in this case.  

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