nà gè nǚháizi zài túshūguǎn lǐ ānjìng de kàn xiǎoshuō.

个 is a measure word (also called a classifier). In Mandarin, when you point out a noun with words like 这 (this) or 那 (that), you usually need a measure word before the noun.

So:

• 那个女孩子 = that girl
• literally: that + classifier + girl

个 is the most common general classifier, and it works naturally with 女孩子 here.

Both 女孩子 and 女孩 mean girl, but 女孩子 can sound a little softer, more natural, or slightly more colloquial in many contexts.

Roughly:

• 女孩 = girl
• 女孩子 = girl / young girl / girl person

In everyday speech, both are common. Here, 女孩子 just sounds natural and friendly.

This is a very common Mandarin location pattern:

• 在 + place + 里/上/下...

So:

• 在图书馆里 = in the library

Here:

• 在 marks location: at / in
• 里 means inside

Together they make the location explicit.

Yes, often you can.

Both of these are natural:

• 在图书馆里
• 在图书馆

The version with 里 emphasizes being inside the library a little more. In many everyday sentences, the difference is small.

So this sentence could also be:

• 那个女孩子在图书馆安静地看小说。

and it would still sound fine.

地 turns an adjective or descriptive phrase into something like an adverb.

So:

• 安静 = quiet / शांत? no, in English: quiet
• 安静地看 = to read quietly

It shows how the action is done.

Compare:

• 安静的女孩子 = a quiet girl
  (的 links description to a noun)
• 安静地看小说 = read novels quietly
  (地 links description to a verb)

In careful standard Mandarin, 安静地看小说 is the clearest and most grammatical form.

In casual speech, native speakers sometimes drop 地, especially in very common expressions, but learners should usually keep it here.

So:

• Standard: 安静地看小说
• More casual/colloquial: 安静看小说 may be heard, but it is better for learners to use 地

Mandarin usually puts extra information like where, when, and how before the main verb.

A common pattern is:

• Subject + location + manner + verb + object

So here:

• 那个女孩子 = subject
• 在图书馆里 = where
• 安静地 = how
• 看 = verb
• 小说 = object

That is why Mandarin says, literally:

• That girl [in the library] [quietly] reads novels

rather than placing those details after the verb the way English often does.

Yes, 看 often means look at or watch, but it is also very commonly used for read, especially in everyday speech.

Examples:

• 看书 = read a book / read books
• 看报 = read the newspaper
• 看小说 = read novels / read a novel

So in this sentence, 看小说 naturally means reading fiction/novels, not just looking at them.

It can mean either, depending on context.

Mandarin nouns often do not have to show singular/plural the way English does. So:

• 看小说 could mean read a novel
• or read novels / do some novel-reading

If the speaker wants to be more specific, they can add more information, for example:

• 看一本小说 = read one novel
• 看那本小说 = read that novel

In your sentence, 小说 is general, so English could translate it in more than one way.

Not necessarily.

Mandarin often does not mark progressive aspect when the context already makes the action clear. This sentence can still naturally describe an action happening right now.

Because the sentence already presents a scene:

• 那个女孩子
• 在图书馆里
• 安静地看小说

it is easy to understand it as That girl is quietly reading novels in the library.

If you want to make the ongoing action more explicit, you could say:

• 那个女孩子正在图书馆里安静地看小说。

But the original sentence is perfectly natural.

Yes. In careful pronunciation, it is nà. But in everyday spoken Mandarin, especially before a classifier like 个, many speakers say something closer to nèi.

So you may hear:

• 那个 pronounced like nà ge
• or more colloquially nèi ge

Both are common in speech, though the written form is still 那个.

Because 那个 is directly modifying the noun 女孩子.

The pattern is:

• 这/那 + measure word + noun

So:

• 那个女孩子 = that girl

You do not use 的 here.

Using 的 would change the structure and usually sound wrong in this case.

Usually it should stay before the verb:

• 那个女孩子在图书馆里安静地看小说。

That is the most natural position.

Sometimes Mandarin allows some movement for emphasis, but for learners, the safest rule is:

• manner expression + 地 + verb

So keep:

• 安静地看

rather than trying to place 安静地 after the verb.

No. By itself, it describes the action as a scene or ongoing event, not as something completed.

There is no completion marker like 了 here.

So the sentence suggests:

• she is quietly reading
• or she quietly reads

If you wanted to show completion, you would need a different form, such as using 了 in the right context.

A useful way to see it is:

• Subject + 在 + place + manner + verb + object

Applied to this sentence:

• 那个女孩子 = subject
• 在图书馆里 = at/in the library
• 安静地 = quietly
• 看 = read
• 小说 = novels / a novel

So the full structure is very typical Mandarin word order.