Do we need to put 在 before 明天 三点钟 星期五 in such sentences like 早在八月我们就开发了一个愿型,or 我是在1997年喜欢上汉语 or 我在八月到的上海?


It depends on whether you use the time term as independent qualifier (can't add 在) or as part of a phrase, especially the prepositional phrase (在 usually must be added), and my suggestion is to avoid this type.

我是在1997年喜欢上汉语 vs 我(是)1997年喜欢上汉语(的), 是 and 的 purely for emphasizing;

我在八月到的上海 vs 我八月到(的)上海, again, 的 for emphasizing.

Also, I recommended try to avoid using 在 at the beginning of a sentence whether to introduce time or place, unless you really want to emphasize "among/during":

在北京,八月最热。 在八月,北京最热。 both sound weird, right?


Yes, you can put in your examples. And...

  1. Pay attention to words like today/tomorrow, you can only add when the time goes as a noun rather an adverb.
    明天会更美好: do not put before.

  2. In particular, for the first example, must be added, check the differences below.
    早在八月...: since August.
    早八月...: error.
    (在)八月初...: in early August.

在北京,八月最热。 在八月,北京最热。 both sound weird, right? 

It's no problem for native user.


Q1: 北京一年裡最熱甚麼時候? 
A1: 在北京,八月最熱。

Q2: 八月中國哪邊最熱?
A2: 在八月,北京最熱。

Q3: 我今天傍晚可以跟你見個面嗎?
A3: 在七點的時候我跟朋友會在台北101吃飯,你早點來,我們可以聊一下。

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