La propriétaire dit que la caution sera rendue à la fin du contrat si tout va bien.

Because propriétaire here refers to a woman, so French uses the feminine article la.

A useful detail: the noun propriétaire often keeps the same spelling for both masculine and feminine. The article tells you the gender:

• le propriétaire = the male owner / landlord
• la propriétaire = the female owner / landlady

So in this sentence, la is what shows that the owner is female.

Here, la caution means the deposit, especially a security deposit in a rental context.

It is a false friend for English speakers:

• English caution = warning / care
• French caution = deposit / guarantee

So in a housing or rental sentence like this one, la caution is the money paid at the start and returned later if everything is fine.

Que introduces a subordinate clause and usually translates as that.

So:

• La propriétaire dit = The landlady says
• que la caution sera rendue... = that the deposit will be returned...

In English, that is often optional:

• The landlady says that the deposit will be returned
• The landlady says the deposit will be returned

In French, que is normally required here.

Sera is the future simple of être.

• être = to be
• il/elle sera = he/she/it will be

It is used because the return of the deposit will happen later, at the end of the contract.

So:

• la caution sera rendue = the deposit will be returned

Because this is a passive construction.

French is saying:

• la caution sera rendue = the deposit will be returned

Structure:

• sera = will be
• rendue = returned

This is like English will be returned.

An active version would be something like:

• La propriétaire rendra la caution... = The landlady will return the deposit...

But the original sentence focuses on the deposit, not on the person doing the action.

Because the past participle in this passive construction agrees with la caution, which is feminine singular.

So:

• masculine singular: rendu
• feminine singular: rendue
• masculine plural: rendus
• feminine plural: rendues

Since la caution is feminine singular, French uses rendue.

It means at the end of the contract.

This part breaks down like this:

• à = at
• la fin = the end
• du contrat = of the contract

And du is a contraction:

• de + le = du

So:

• de le contrat becomes du contrat

Because French usually uses an article where English might not.

In English, we often say end of contract or end of the contract. In French, you normally say:

• la fin du contrat = the end of the contract

Here:

• de + le contrat becomes du contrat

So du is just the normal contracted form.

Because after si meaning if, French normally does not use the future when talking about a real future condition.

So French says:

• si tout va bien = if everything goes well

Even though the result is in the future:

• la caution sera rendue = the deposit will be returned

This is a very important pattern:

• Si + present, future

For example:

• Si j’ai le temps, je viendrai.
• If I have time, I will come.

Not:

• Si j’aurai le temps... ❌

So in your sentence, si tout va bien is exactly what French expects.

Yes, it is a very common expression meaning everything is going well or everything is fine.

Literally:

• tout = everything
• va = goes
• bien = well

So word-for-word, it is everything goes well, but in natural English it often means:

• everything is fine
• all goes well
• everything goes smoothly

In this sentence, it implies if there are no problems.

Yes. In everyday modern rental French, you will also hear le dépôt de garantie.

Both can refer to the rental deposit, though dépôt de garantie is often more formal or precise in legal/housing contexts.

So:

• la caution = common everyday way to refer to the deposit
• le dépôt de garantie = more official/legal term

A learner should recognize both.

The structure is:

• La propriétaire dit
• que la caution sera rendue
• à la fin du contrat
• si tout va bien

So, piece by piece:

1. La propriétaire dit
   = The landlady says

2. que la caution sera rendue
   = that the deposit will be returned

3. à la fin du contrat
   = at the end of the contract

4. si tout va bien
   = if everything goes well

So the full pattern is:

subject + verb + que + subordinate clause + time phrase + condition

Yes, depending on context.

Propriétaire basically means owner. But in a rental situation, it often refers to the landlord/landlady.

So possible translations include:

• the owner
• the landlady
• the landlord if masculine

Since this sentence talks about la caution and le contrat, the rental meaning is very likely, so landlady is a natural translation.