wǒmen zài túshūguǎn rènzhēn fùxí Hànzì.

we

Breakdown of wǒmen zài túshūguǎn rènzhēn fùxí Hànzì.

• 在zài: at
• 复习fùxí: to review
• 图书馆túshūguǎn: library

Questions & Answers about wǒmen zài túshūguǎn rènzhēn fùxí Hànzì.

In this sentence, what is the role of 在 before 图书馆?

Here 在 works like a preposition meaning “at / in”, introducing the place where the action happens.

Basic pattern:

• Subject + 在 + place + Verb (+ Object)
  
  • 我们在图书馆复习汉字。
    → We review Chinese characters in the library.

So 在图书馆 is a place phrase: in the library. It tells where the action 复习 happens.

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Can I say 在图书馆里 instead of 在图书馆? Is there any difference?

Yes, you can say 在图书馆里. Both are correct:

• 我们在图书馆认真复习汉字。
• 我们在图书馆里认真复习汉字。

Nuance:

• 在图书馆 – neutral “at/in the library”.
• 在图书馆里 – emphasizes “inside the library”, as opposed to outside the building.

In many cases, especially with buildings/rooms, 里 is optional, and everyday speech often just uses 在图书馆.

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What exactly does 认真 mean here? Is it more like “carefully” or “seriously”?