Soudain, il propose de déplacer les meubles dans le salon, car le tapis gêne un peu.

Both exist, but soudain is very common as an adverb meaning suddenly.

• Soudain = suddenly
• Soudainement = suddenly, but often feels a bit more formal or literary

In everyday French, soudain is often the more natural choice.

After proposer, French often uses de + infinitive when someone suggests doing something.

So:

• proposer de faire quelque chose = to suggest doing something

Examples:

• Il propose de partir. = He suggests leaving.
• Elle propose d’attendre. = She suggests waiting.

Here:

• il propose de déplacer les meubles = he suggests moving the furniture

Because after propose de, French uses the infinitive.

• déplacer is the infinitive: to move
• French often uses this structure where English also uses an -ing form:
  • He suggests moving the furniture
  • French: Il propose de déplacer les meubles

So even though English says moving, French uses the infinitive déplacer.

Déplacer means to move something from one place to another.

It is usually used for moving an object, piece of furniture, or something physical.

Examples:

• déplacer une chaise = to move a chair
• déplacer une table = to move a table

It is different from:

• bouger = to move, to budge, to be in motion
• déménager = to move house / relocate

So here déplacer les meubles means to move the furniture around / to move the pieces of furniture.

In French, nouns usually need an article much more often than in English.

So French says:

• les meubles = the furniture / the pieces of furniture

Even when English might say just furniture, French generally keeps the article.

Also, meubles is plural because French often treats furniture as countable pieces:

• un meuble = a piece of furniture
• des meubles / les meubles = pieces of furniture / the furniture

Because furniture in English is usually an uncountable noun, but in French meuble is a normal countable noun.

So:

• English: furniture
• French: meubles when referring to several items

Examples:

• There is a lot of furniture.
• Il y a beaucoup de meubles.

French does not usually use meuble as one big collective noun in the same way English uses furniture.

Dans le salon means in the living room.

• dans = in / inside
• le salon = the living room

It tells us where the furniture is being moved.

French often uses dans for being inside a room or enclosed space:

• dans la cuisine = in the kitchen
• dans la chambre = in the bedroom

Both can mean because, but they are not used in exactly the same way.

• car is a little more formal or written
• parce que is more common in everyday speech

So:

• car le tapis gêne un peu
• parce que le tapis gêne un peu

Both are correct here, but car can sound slightly more polished or explanatory.

Gêne comes from the verb gêner, which means things like:

• to bother
• to get in the way
• to hinder
• to inconvenience

In this sentence, le tapis gêne un peu means the rug is a bit in the way or causing a slight problem.

So it is not necessarily about emotional annoyance; it can be physical obstruction too.

For example:

• Cette chaise gêne le passage. = This chair is blocking the way.
• Le bruit me gêne. = The noise bothers me.

Because gêne is the conjugated verb, while gênant is usually an adjective or present participle.

Here we need a verb because le tapis is the subject:

• le tapis gêne = the rug bothers / gets in the way

Compare:

• Le tapis gêne. = The rug is in the way.
• Le tapis est gênant. = The rug is bothersome / inconvenient.

Both are possible in some contexts, but they are different structures.

Un peu means a little or a bit.

So:

• le tapis gêne = the rug is in the way
• le tapis gêne un peu = the rug is a bit in the way

It softens the statement. It sounds less strong and more natural in many situations.

Because French usually follows a normal subject + verb + complement order.

Here:

• le tapis = subject
• gêne = verb
• un peu = adverb

So:

• le tapis gêne un peu = the rug is a bit in the way

If you said gêne le tapis, that would suggest something like bothers the rug, which changes the meaning completely.

Usually, yes, in everyday modern French.

• le salon = the living room / sitting room

In some contexts, salon can also mean:

• a lounge
• a formal sitting room
• a trade fair or exhibition, as in un salon du livre

But in a home sentence like this one, le salon clearly means the living room.

The comma helps separate the main idea from the explanation:

• il propose de déplacer les meubles dans le salon
• car le tapis gêne un peu

It works a lot like a comma before because or since in English when the second part gives a reason. French punctuation can vary, but this comma is very natural here.

In this sentence, it most naturally means moving the furniture within the living room or in the living room.

That is because déplacer les meubles dans le salon usually suggests that the furniture is being rearranged there.

If French wanted to make into the living room especially clear, it might use context or a different structure, such as:

• déplacer les meubles vers le salon = move the furniture toward the living room
• mettre les meubles dans le salon = put the furniture in the living room

So here the most likely meaning is rearranging the furniture in the living room.