Мы наконец избавились от шума.

Избавились is the past tense plural form of избавиться.

Here is how it breaks down:

• избавиться = to get rid of, to free oneself from
• избавил- = past tense stem
• -и = plural marker in the past
• -сь = reflexive ending

Because the subject is мы (we), the verb must be plural in the past tense:

• я избавился / избавилась = I got rid of
• ты избавился / избавилась = you got rid of
• мы избавились = we got rid of

In Russian past tense, verbs agree with the subject in gender and number, not person.

The -сь is the reflexive ending. The full verb is избавиться.

In this verb, the reflexive form is just part of the normal dictionary form and meaning. You usually learn it as:

• избавиться от чего-то = to get rid of something
• избавляться от чего-то = to be getting rid of something / to get rid of something habitually

It does not always mean a literal English reflexive like wash oneself. Here it is simply the standard Russian verb pattern.

A very literal sense is something like:

• избавиться от шума = to free oneself from the noise

But in natural English, this is usually just:

• to get rid of the noise

Because the verb избавиться requires the preposition от plus the genitive case.

So the pattern is:

• избавиться от + genitive
• избавились от шума

You cannot normally say избавились шум.

Some more examples:

• избавиться от проблемы = to get rid of a problem
• избавиться от страха = to get rid of fear
• избавиться от долгов = to get rid of debts

So шума is not random—it is genitive because of от after this verb.

Because шум is in the genitive singular after от.

Base form:

• шум = noise

After от:

• от шума = from noise / of noise, depending on context

This is a very common case change in Russian. Masculine nouns often add -а in the genitive singular:

• дом → дома
• стол → стола
• шум → шума

So in this sentence:

• Мы наконец избавились от шума
• literally: We finally got rid of the noise

Here наконец means finally.

It shows that this happened after some delay, difficulty, or long انتظار-like wait:

• Мы наконец избавились от шума = We finally got rid of the noise

It often carries a feeling like:

• it took a while
• we had been wanting this
• the problem is over now

Be aware that наконец can sometimes also mean something closer to at last or even in the end, depending on context.

Yes, the word order can change. Russian word order is flexible, and changing it often changes emphasis rather than basic meaning.

The neutral version here is:

• Мы наконец избавились от шума.

Possible alternatives:

• Наконец мы избавились от шума.
  More emphasis on finally
• От шума мы наконец избавились.
  More emphasis on the noise
• Избавились мы наконец от шума.
  Possible in speech, but more marked or expressive

So the original sentence is natural and neutral. Russian uses word order partly to manage what is already known and what is being highlighted.

Избавились comes from the perfective verb избавиться.

Russian verbs usually come in aspect pairs:

• избавляться = imperfective
• избавиться = perfective

Why perfective here?

Because the sentence describes a completed result:

• We finally got rid of the noise

That is a finished achievement, so perfective is the natural choice.

Compare:

• Мы избавлялись от шума.
  We were getting rid of the noise / trying to deal with the noise
  This focuses on the process, not the completed result.

• Мы избавились от шума.
  We got rid of the noise
  This focuses on the result.

Yes, often it could.

Russian frequently drops subject pronouns when the subject is clear from context:

• Наконец избавились от шума.

This can still mean We finally got rid of the noise, depending on the situation.

However, in the past tense, Russian verbs do not show person clearly the way present-tense forms do. Избавились only tells you the subject is plural, not specifically we. It could theoretically mean we, you plural, or they, depending on context.

So adding мы makes the subject explicit.

Yes, there is overlap, but they are not always identical.

• избавиться от = to get rid of, to eliminate, to free oneself from something unwanted
• освободиться от = to free oneself from, to become free from

In many contexts both are possible, but избавиться от often sounds more like removing a problem, burden, nuisance, or unwanted thing.

For example:

• избавиться от шума = get rid of the noise
• освободиться от шума = become free from the noise

The first is usually the more natural everyday choice for this sentence.

Because избавиться is perfective, it does not have a true present tense meaning. Its present-tense forms usually refer to the future.

So:

• Мы избавимся от шума. = We will get rid of the noise

If you want a real present/process meaning, use the imperfective:

• Мы избавляемся от шума. = We are getting rid of the noise / We get rid of the noise

Past forms:

• Мы избавлялись от шума. = We were getting rid of the noise
• Мы избавились от шума. = We got rid of the noise

The stress is:

• Мы наконе́ц изба́вились от шу́ма.

Word stress:

• наконе́ц
• изба́вились
• шу́ма

A rough pronunciation guide:

• Мы = my
• наконе́ц = nuh-kuh-NYETS
• изба́вились = eez-BA-vee-lees
• от = ot
• шу́ма = SHOO-muh

The unstressed vowels are reduced in normal speech, so they may sound less clear than their spelling suggests.