Si je m’assois dans le fauteuil, le chaton vient ronronner près de moi.

Yes. Si here means if.

In this sentence, si + present tense introduces a real or likely condition:

• Si je m’assois dans le fauteuil, le chaton vient ronronner près de moi.

This often has a general / habitual meaning, like:

• If I sit in the armchair, the kitten comes and purrs near me.
• or more naturally in English: Whenever I sit in the armchair, the kitten comes to purr near me.

So this is not a doubtful or imaginary situation. It describes something that regularly happens.

Because the verb here is s’asseoir, a reflexive verb, meaning to sit down.

So:

• je m’assois = I sit down
• literally: I seat myself

The reflexive pronoun changes with the subject:

• je m’assois
• tu t’assois
• il/elle/on s’assoit
• nous nous asseyons
• vous vous asseyez
• ils/elles s’assoient

French often uses the reflexive form where English simply uses sit down.

M’ is the shortened form of me, the reflexive pronoun for je.

Before a vowel sound, me becomes m’:

• me + assois → m’assois

This is called elision.

You will see the same thing in many common verbs:

• je m’appelle
• je m’habille
• je m’endors

So je m’assois is just the normal spelling.

Un fauteuil usually means an armchair or easy chair.

So:

• dans le fauteuil = in the armchair

French often uses dans where English might say in or sometimes on, depending on the object. With a chair like an armchair, dans feels natural because it is something you sit into, not just onto.

Compare:

• sur une chaise = on a chair
• dans un fauteuil = in an armchair

Le chaton means the kitten.

French often uses the definite article when the thing is already known from context, even if English might sometimes say my kitten, our kitten, or just the kitten depending on the situation.

So here, le chaton probably refers to a specific kitten that both speaker and listener can identify.

• le chaton = the kitten
• un chaton = a kitten

If you said un chaton, it would sound more like introducing a kitten for the first time, not a familiar one.

Vient ronronner literally means comes to purr.

This adds the idea of movement toward the speaker first, and then the action of purring.

So:

• le chaton ronronne près de moi = the kitten purrs near me
• le chaton vient ronronner près de moi = the kitten comes over and purrs near me

The second version is more vivid. It suggests the kitten actively approaches the speaker.

Here venir + infinitive is being used in its very literal sense:

• venir = to come
• ronronner = to purr

Not really.

French can use aller + infinitive for the near future:

• il va manger = he is going to eat

But venir + infinitive usually does not work the same way.

In this sentence, vient ronronner is literal:

• the kitten comes
• and then purrs

So this is not a future construction. It is an ordinary present-tense verb vient followed by an infinitive that explains what the kitten comes to do.

After a preposition like de, French uses a stressed pronoun, not an object pronoun.

So:

• près de moi = near me
• près de toi = near you
• près de lui / d’elle = near him / her

You cannot say près de me.

Compare:

• Il me voit. = He sees me.
  Here me is a direct object pronoun.

• Il est près de moi. = He is near me.
  Here moi is used because it comes after the preposition de.

Most likely it means something that happens regularly or typically.

French uses the present tense for both:

1. what is happening now
2. habits / repeated actions / general truths

In this sentence, because of si, the most natural reading is habitual:

• If I sit in the armchair, the kitten comes to purr near me.
• Whenever I sit in the armchair, the kitten comes to purr near me.

So the present tense here describes a repeated pattern, not just one single moment.

Sometimes yes, depending on context.

In English, a sentence like this often sounds more natural as:

• When I sit in the armchair, the kitten comes to purr beside me.
• or Whenever I sit in the armchair...

That is because the French si here can introduce a condition that regularly leads to the same result.

However, grammatically, si still means if, not when.
French also has quand for when.

So:

• literal meaning: if
• natural English interpretation in a habitual context: often when or whenever

Yes, but the meaning changes slightly.

• près de moi = near me
• à côté de moi = next to me / beside me

À côté de moi is more specific: it suggests the kitten is right beside the speaker.

Près de moi is a little broader: the kitten is close, but not necessarily immediately at the speaker’s side.

So both are possible, but près de moi is slightly less exact.

Yes: s’asseoir is a verb with more than one accepted pattern, and learners often notice different forms.

Common modern forms include:

• je m’assois
• tu t’assois
• il s’assoit
• nous nous asseyons
• vous vous asseyez
• ils s’assoient

But you may also encounter forms related to asseoir / s’asseoir in different registers or patterns.

For a learner, the most useful thing is:

• recognize je m’assois as a standard, correct form
• understand that it means I sit down

A rough pronunciation guide:

• Si je m’assois dans le fauteuil, le chaton vient ronronner près de moi.

Approximate English-friendly pronunciation:

• see zhuh mah-SWAH dahn luh fo-tuy, luh sha-ton vee-ehn ron-ro-nay preh duh MWAH

A few key points:

• m’assois sounds roughly like mah-SWAH
• vient is nasal; the end is not pronounced like a full English t
• ronronner has the French r, produced farther back in the throat
• près de moi ends with stressed moi, roughly mwah

If you want to sound natural, pay special attention to rhythm rather than pronouncing every letter separately.