wǒ juéde zhè jiān jiàoshì bǐ túshūguǎn chǎo duō, zài lǐmiàn xuéxí bú tài shūfu.

In Mandarin, you normally need a classifier between a demonstrative like 这 and a noun.

The pattern is:

这 / 那 + classifier + noun

So:

• 这间教室 = this classroom
• 那间教室 = that classroom

间 is a common classifier for rooms and enclosed spaces.
You may also hear 这个教室. That is also understandable, but 间 is more specific and natural for rooms.

我觉得 means I think or I feel.

It shows that the speaker is giving a personal judgment, not just stating a hard fact. In English, it softens the sentence a bit:

• 我觉得这间教室很吵。 = I think this classroom is noisy.
• Without 我觉得, the statement sounds more direct.

So here it frames the whole sentence as the speaker’s opinion.

比 is the basic Mandarin comparison word, similar to than in English.

The usual pattern is:

A 比 B + adjective/state

So here:

这间教室比图书馆吵
= This classroom is noisier than the library.

Notice that Mandarin does not need a separate word like more before the adjective in this structure. The comparison is already shown by 比.

For learners, it is easiest to think of 吵 here as meaning noisy, so it works like an adjective in English.

But grammatically, many Mandarin adjectives behave like stative verbs. That means they can directly act as the predicate of a sentence.

For example:

• 教室很吵。 = The classroom is noisy.
• 这间教室比图书馆吵。 = This classroom is noisier than the library.

So you do not need a separate verb like is.

In a simple statement, Mandarin often uses 很 before an adjective-like word:

• 这间教室很吵。 = This classroom is noisy.

But after 比, you normally do not use 很:

• 这间教室比图书馆吵。

That is because the comparison structure already does the job. Adding 很 there would sound wrong.

Here, 多 adds emphasis and means something like much or a lot:

• 比图书馆吵多 = much noisier than the library

However, learners should know that in more standard or careful Mandarin, people more often say:

• 比图书馆吵得多
• 比图书馆吵多了

These are more natural ways to say much noisier. So the role of 多 is to strengthen the comparison.

在里面 means inside or in there.

In this sentence, it refers back to 这间教室. Chinese often avoids repeating a noun when the meaning is already clear from context.

So:

• 在里面学习 = study in there / study inside it

A fuller version would be:

• 在这间教室里面学习

But that sounds more repetitive. The shorter version is natural because everyone already knows 里面 refers to the classroom.

The phrase 在里面学习 acts like the topic or subject of the second clause.

Literally, it is something like:

• Studying in there is not very comfortable.

So the structure is:

[doing something somewhere] + 不太舒服

This is very normal in Mandarin. A whole action can come first, and then the speaker comments on it.

You could think of it as:

• 在里面学习 = studying in there
• 不太舒服 = is not very comfortable

Literally, 不太舒服 means not very comfortable.

In context, it means the classroom is not a comfortable place to study. This expression is a bit softer and less blunt than a stronger negative statement.

Compare:

• 不太舒服 = not very comfortable
• 很不舒服 = very uncomfortable

So 不太舒服 often sounds more natural and polite in everyday speech.

This is because of a common tone change rule.

不 is normally fourth tone: bù.
But before another fourth-tone syllable, it changes to second tone: bú.

Here the next syllable is 太, which is fourth tone:

• 不太 → bú tài

You will see the same thing in words like:

• 不是 → bú shì
• 不要 → bú yào

In 觉得, the second syllable is usually pronounced with a neutral tone, so it becomes juéde, not juédé.

This is very common in everyday Mandarin. Many frequent two-syllable words have a full tone on the first syllable and a lighter, shorter neutral tone on the second.

So:

• 觉得 = juéde
• not usually juédé

When speaking, make de light and quick.

The comma separates two closely connected ideas:

1. 这间教室比图书馆吵多
2. 在里面学习不太舒服

In English, you might connect them with so, and, or just a pause:

• This classroom is much noisier than the library, so studying in there is not very comfortable.

Chinese often links related clauses with a comma without needing an extra connecting word.