<ul>
<li>Grammatically correct:</li>
</ul>

<p>她睡觉的时候，她的朋友正在上网。</p>

<p>她在睡觉的时候，她的朋友正在上网。</p>

<p>To me, they have basically the same meaning. There are two 在 in the second sentence, and that feels kind of like a redundancy. I more often omit the first 在, especially when speaking.</p>

<ul>
<li>Grammatically wrong:</li>
</ul>

<p>她睡觉时候，她的朋友正在上网。</p>

<p>她在睡觉时候，她的朋友正在上网。</p>

<p>If you want to use "something ... 时候", you will use "<strong>something ... 的時候</strong>". You cannot omit the 的. Or if you really want to omit the 的, you should use "<strong>something ... 时</strong>", instead of "something ... 时候".</p>

<p>i.e. "她睡觉时，她的朋友正在上网。" and "她在睡觉时，她的朋友正在上网。" are correct. And again, "她睡觉时" sounds more natural to me, but both are grammatically correct.</p>

CC BY-SA 4.0
2018-05-13T08:45:02.147Z
2018-05-13T08:45:02.147Z
thyu
<p>她在睡觉的时候 is the most completed one.</p>

<p>她睡觉的时候 is OK</p>

<p><code>她睡觉时候</code> and <code>她在睡觉时候</code> are wrong.</p>

<p>But these are also correct:</p>

<p><code>他在睡觉时</code> 
<code>他睡觉时</code></p>

CC BY-SA 4.0
2018-05-13T01:58:00.650Z
2018-05-13T01:58:00.650Z
sfy
<blockquote>
  <ol>
  <li><p>她在睡觉的时候，她的朋友正在上网。</p></li>
  <li><p>她睡觉时候，她的朋友正在上网。</p></li>
  </ol>
  
  <p>3.她在睡觉时候，她的朋友正在上网。</p>
</blockquote>

<p>The first one is the most natural way to say it, grammatically and formally. </p>

<p>The second one is ok in colloquial contexts with omitting both 在 and 的. </p>

<p>The third one is a bit odd because it adds 在, I may expect the interlocutor to say the full version. Otherwise, I expect they say the shorten version like the second one. </p>

<p>But, in practice, especially when you speak fast, it really doesn't matter. These sentences are all ok, though the first one is preferable. There are no problems for understanding. They all could sound natural if you have a good command of Chinese speaking. </p>

CC BY-SA 4.0
2018-05-13T01:46:11.150Z
2018-05-13T01:46:11.150Z
dan
<p>Conclusion is 在 may be omitted without problems, but if you want to omit 的, you’d better omit 候 at the same time.</p>

CC BY-SA 4.0
2022-11-12T07:47:19.557Z
2022-11-12T07:47:19.557Z
Geoffrey Chang
<p>In class, we learned this sentence:</p>

<blockquote>
  <p><strong>她睡觉的时候</strong>，她的朋友正在上网。<br>
  Tā shuìjiào de shíhòu. Tāde péngyǒu zhèngzài shàngwǎng.</p>
</blockquote>

<p>My question is about the following three variants.  For the first, we add in a 在 (zài):</p>

<blockquote>
  <p><strong>她在睡觉的时候</strong>，她的朋友正在上网。</p>
</blockquote>

<p>For the second we omit the 的 (de):</p>

<blockquote>
  <p><strong>她睡觉时候</strong>，她的朋友正在上网。</p>
</blockquote>

<p>And for the third we add in a 在 (zài) and omit the 的 (de):</p>

<blockquote>
  <p><strong>她在睡觉时候</strong>，她的朋友正在上网。</p>
</blockquote>

<p><strong>Question</strong>: Which of these are grammatically correct and do they all have the same meaning?</p>

<p>I feel the first variant is correct, <a href="http://dict.youdao.com/w/%E5%A5%B9%E5%9C%A8%E7%9D%A1%E8%A7%89%E7%9A%84%E6%97%B6%E5%80%99" rel="nofollow noreferrer">YouDao.com</a> gives an example "当她在睡觉的时候笑了..." which seems similar (but the 在 might be part of a different grammar construct here: 在[x]笑了).  The latter two examples might be wrong as most examples I've found include the 的, but I'm not sure, as I found "...但在睡觉时候..." on <a href="http://dict.youdao.com/w/%E5%9C%A8%E7%9D%A1%E8%A7%89%E6%97%B6%E5%80%99/" rel="nofollow noreferrer">YouDao.com</a>.</p>

CC BY-SA 4.0
2019-05-24T01:42:01.263Z
either 她在睡觉的时候 or 她在睡觉时 or 她睡觉的时候 or 她睡觉时 is acceptable, but 她睡觉时候 and 她在睡觉时候 are not.
xenophōn
<grammar><meaning><word-choice>
Which of "她睡觉的时候...", "她在睡觉的时候...", "她睡觉时候...", and "她在睡觉时候..." are grammatically correct and do they all have the same meaning?
# Which of "她睡觉的时候...", "她在睡觉的时候...", "她睡觉时候...", and "她在睡觉时候..." are grammatically correct and do they all have the same meaning?

(Asked by: username_0 on 2018-05-13)

In class, we learned this sentence:

> **她睡觉的时候**，她的朋友正在上网。  
> Tā shuìjiào de shíhòu. Tāde péngyǒu zhèngzài shàngwǎng.

My question is about the following three variants. For the first, we add in a 在 (zài):

> **她在睡觉的时候**，她的朋友正在上网。

For the second we omit the 的 (de):

> **她睡觉时候**，她的朋友正在上网。

And for the third we add in a 在 (zài) and omit the 的 (de):

> **她在睡觉时候**，她的朋友正在上网。

**Question**: Which of these are grammatically correct and do they all have the same meaning?

I feel the first variant is correct, [YouDao.com](http://dict.youdao.com/w/%E5%A5%B9%E5%9C%A8%E7%9D%A1%E8%A7%89%E7%9A%84%E6%97%B6%E5%80%99) gives an example "当她在睡觉的时候笑了..." which seems similar (but the 在 might be part of a different grammar construct here: 在[x]笑了). The latter two examples might be wrong as most examples I've found include the 的, but I'm not sure, as I found "...但在睡觉时候..." on [YouDao.com](http://dict.youdao.com/w/%E5%9C%A8%E7%9D%A1%E8%A7%89%E6%97%B6%E5%80%99/).

**Tags:** grammar, meaning, word-choice
> **Comments:**
> **username_1**: either 她在睡觉的时候 or 她在睡觉时 or 她睡觉的时候 or 她睡觉时 is acceptable, but 她睡觉时候 and 她在睡觉时候 are not.  

---

## 4 answers

### Answer by username_2 on 2018-05-13. Score: 1 | Accepted answer

* Grammatically correct:

她睡觉的时候，她的朋友正在上网。

她在睡觉的时候，她的朋友正在上网。

To me, they have basically the same meaning. There are two 在 in the second sentence, and that feels kind of like a redundancy. I more often omit the first 在, especially when speaking.

* Grammatically wrong:

她睡觉时候，她的朋友正在上网。

她在睡觉时候，她的朋友正在上网。

If you want to use "something ... 时候", you will use "**something ... 的時候**". You cannot omit the 的. Or if you really want to omit the 的, you should use "**something ... 时**", instead of "something ... 时候".

i.e. "她睡觉时，她的朋友正在上网。" and "她在睡觉时，她的朋友正在上网。" are correct. And again, "她睡觉时" sounds more natural to me, but both are grammatically correct.


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### Answer by username_3 on 2018-05-13. Score: 1

她在睡觉的时候 is the most completed one.

她睡觉的时候 is OK

`她睡觉时候` and `她在睡觉时候` are wrong.

But these are also correct:

`他在睡觉时`
`他睡觉时`


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### Answer by username_4 on 2018-05-13. Score: 1

> 1. 她在睡觉的时候，她的朋友正在上网。
> 2. 她睡觉时候，她的朋友正在上网。
>
> 3.她在睡觉时候，她的朋友正在上网。

The first one is the most natural way to say it, grammatically and formally.

The second one is ok in colloquial contexts with omitting both 在 and 的.

The third one is a bit odd because it adds 在, I may expect the interlocutor to say the full version. Otherwise, I expect they say the shorten version like the second one.

But, in practice, especially when you speak fast, it really doesn't matter. These sentences are all ok, though the first one is preferable. There are no problems for understanding. They all could sound natural if you have a good command of Chinese speaking.


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### Answer by username_5 on 2022-11-12. Score: 1

Conclusion is 在 may be omitted without problems, but if you want to omit 的, you’d better omit 候 at the same time.


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