Если поставить ударение неправильно, смысл слова может стать неясным.

Russian often leaves the subject unstated when the meaning is general.

Here поставить ударение неправильно means something like:

• if you place the stress incorrectly
• if one places the stress incorrectly
• if the stress is placed incorrectly

So the sentence is making a general statement, not talking about one specific person.

Because this kind of clause can use an infinitive to express a general action without naming who does it.

So Если поставить ударение неправильно literally looks like If to place the stress incorrectly, but in natural English it means If you place the stress incorrectly or If the stress is placed incorrectly.

This is a common Russian way to make a general statement.

Поставить is the perfective form, while ставить is imperfective.

Here the idea is a single completed action: placing the stress on a word in a particular way. Russian often uses the perfective in if/when clauses when it refers to one complete result:

• Если поставить ударение неправильно... = If you place the stress incorrectly...

Using ставить would sound more like a repeated or ongoing action, which is not the main idea here.

Because it is the direct object of поставить.

Russian says поставить ударение = to place the stress / to stress.

Since ударение is a neuter noun, its nominative and accusative forms are the same:

• nominative: ударение
• accusative: ударение

So you do not see a form change, but grammatically it is accusative here.

Literally, it means to place the stress.

This is a normal Russian expression for talking about word stress. English often says:

• to put the stress on...
• to stress a syllable
• to accent a syllable

So поставить ударение неправильно means to place the stress incorrectly.

Неправильно is an adverb meaning incorrectly or wrongly.

It describes how the stress is placed:

• поставить ударение неправильно = to place the stress incorrectly

It modifies the action, not the noun.

Because Если поставить ударение неправильно is a subordinate if-clause, and in Russian such clauses are normally separated by a comma from the main clause.

So the structure is:

• Если ... , ...
• If ... , ...

This comma is standard Russian punctuation.

Because слова depends on смысл and means of the word.

• смысл = meaning
• слова = of the word

So смысл слова literally means the meaning of the word.

This is a very common Russian pattern: one noun followed by another noun in the genitive to show possession or relationship.

This is a normal way to say can become.

• может = can / may
• стать = become

So:

• может стать неясным = can become unclear

Russian often uses a modal verb plus an infinitive, just like English:

• can become
• может стать

Because after стать meaning to become, Russian usually puts the predicate noun or adjective in the instrumental case.

Here:

• смысл = masculine singular
• неясный = nominative masculine singular
• неясным = instrumental masculine singular

So:

• смысл может стать неясным = the meaning can become unclear

This instrumental after стать is very common.

Not in this exact structure.

With стать, the normal form is the instrumental:

• стать неясным

The short form неясен is used in different sentence patterns, for example:

• Смысл слова неясен. = The meaning of the word is unclear.

So:

• смысл слова неясен = a state
• смысл слова может стать неясным = can become unclear

The given word order is natural and clear.

• Если поставить ударение неправильно, смысл слова может стать неясным.

Russian word order is fairly flexible, but changing it can shift emphasis. For example:

• Если неправильно поставить ударение, смысл слова может стать неясным.

This also sounds natural and means essentially the same thing. The original sentence is a very standard way to say it.

The stressed syllables are:

• Е́сли
• постави́ть
• ударе́ние
• непра́вильно
• смы́сл
• сло́ва
• мо́жет
• стать
• нея́сным

So the full sentence with stress marks is:

Е́сли постави́ть ударе́ние непра́вильно, смы́сл сло́ва мо́жет стать нея́сным.

This is especially useful here, because the sentence itself is about stress placement.