Лучше не вырывать страницы из тетради.

Russian often leaves the subject unstated in general advice.
Лучше не + infinitive is an impersonal pattern meaning something like:

• It’s better not to...
• You’d better not...
• People shouldn’t really...

So Лучше не вырывать страницы из тетради is not about one specific person only. It sounds like a general recommendation.

Here лучше means better.

It is the comparative form related to хорошо and is very commonly used in advice:

• Лучше подождать — Better to wait
• Лучше не спорить — Better not to argue

So in this sentence, лучше does not describe a noun. It works as part of the whole idea it is better to...

These expressions are similar, but not identical:

• Лучше не вырывать... = it’s better not to do that, a recommendation
• Не надо вырывать... = don’t do that / no need to do that
• Нельзя вырывать... = it is not allowed / forbidden

So лучше не вырывать страницы из тетради sounds like advice or a sensible rule, not a strict ban.

Вырывать is the imperfective infinitive. That is the normal choice for general advice, habits, or rules.

Here the sentence is talking about the action in general:
It’s better not to tear pages out of a notebook.

The perfective partner is вырвать. That form points more to one completed act. In a broad recommendation like this, imperfective вырывать sounds more natural.

So:

• не вырывать = not to tear out pages, as a general action
• не вырвать would sound much less natural here

Вырывать means to tear out or to rip out, especially by pulling something out from where it is attached.

That is why it works well with pages from a notebook.

Compare:

• рвать = to tear
• вырывать = to tear out, rip out
• вырвать = perfective version of вырывать

So вырывать страницы is specifically about removing pages from the notebook, not just damaging them.

Страницы is the accusative plural, because it is the direct object of the verb вырывать.

The noun is страница. Its plural nominative is страницы. Since it is an inanimate noun, the accusative plural has the same form:

• nominative plural: страницы
• accusative plural: страницы

So the sentence is literally structured as:

• вырывать — to tear out
• страницы — pages
• из тетради — from a notebook

The preposition из means out of or from inside, and it requires the genitive case.

So:

• dictionary form: тетрадь
• after из: из тетради

This makes sense because pages are being removed out of a notebook.

A good literal way to see it is:

• страницы из тетради = pages out of the notebook

Yes, it could be singular, but the plural sounds natural for a general statement.

• Лучше не вырывать страницы из тетради = better not to tear pages out of a notebook
• Лучше не вырывать страницу из тетради = better not to tear a page out of the notebook

The plural is common when speaking about a typical action or general rule. It is not about one particular page, but about the behavior in general.

Yes. Russian word order is flexible.

The original order is neutral and natural:

• Лучше не вырывать страницы из тетради.

But you could also say:

• Страницы из тетради лучше не вырывать.

This puts more focus on pages from a notebook.

The basic meaning stays the same, but the emphasis shifts depending on what the speaker wants to highlight.

It is basically neutral. It could appear in speech, in a classroom, in instructions, or in general advice.

It does not sound especially formal or especially casual. That makes it a very useful everyday pattern:

• Лучше не спешить.
• Лучше не трогать это.
• Лучше не опаздывать.