Nous prenons soin de la maison.

Because the verb is prendre and it is conjugated for nous (we) in the present tense.

• je prends = I take
• tu prends = you take
• il/elle prend = he/she takes
• nous prenons = we take
• vous prenez = you take / you take care
• ils/elles prennent = they take

So Nous prenons... means We take...

Yes. Prendre soin de is a very common French expression meaning to take care of someone or something.

So:

• prendre soin de la maison = to take care of the house
• prendre soin d’un enfant = to take care of a child
• prendre soin de soi = to take care of oneself

You should learn it as a whole expression, not word by word.

Because the expression is built this way: prendre soin de + noun/person.

The de links soin to the thing or person being cared for.

Examples:

• prendre soin de la maison = take care of the house
• prendre soin des enfants = take care of the children
• prendre soin du jardin = take care of the garden

So de is required here. You cannot say prendre soin la maison.

Because after prendre soin de, you still need the normal article for the noun.

Here the noun is maison, which is feminine singular, so the article is la.

That gives:

• de + la maison → de la maison

Compare:

• de + le jardin → du jardin
• de + les enfants → des enfants
• de + l’enfant → de l’enfant

So de la maison is just of the house / of the home inside this expression.

Because French word order does not work that way here.

The natural structure is:

subject + prendre + soin de + noun

So:

• Nous prenons soin de la maison.

Not:

• Nous prenons de la maison soin.
• Nous prenons la maison.

Also, Nous prenons la maison would mean something like We are taking the house or We are choosing the house, not taking care of the house.

Yes, soin often means care, but it is very commonly used in set expressions.

For example:

• prendre soin de = to take care of
• les soins = care, treatment
• avec soin = carefully / with care

In your sentence, soin is part of the expression prendre soin de.

Usually no, not in the same everyday sense.

The verb soigner often means:

• to care for a person or animal
• to treat medically
• to do something with great care

For a house, prendre soin de la maison is the normal way to say take care of the house.

Soigner la maison would sound unusual unless you mean something more like maintain it carefully, restore it carefully, or use a more literary style.

It can be understood as either house or home, depending on context.

• house if you are talking about the building
• home if you are talking more generally about the place you live

French maison often covers both ideas.

A common pronunciation is approximately:

Noo pruh-nohn swan duh lah meh-zohn

A few useful points:

• nous sounds like noo
• prenons has a nasal ending: pruh-nohn
• soin is pronounced like a nasal sound, roughly swan
• maison sounds roughly like meh-zohn

Also, in careful speech you may hear a liaison between nous and prenons:

• nous-z-prenons

But many learners first focus on saying each word clearly.

Yes, but in casual spoken French, people often use on instead of nous.

So in conversation, you are very likely to hear:

• On prend soin de la maison.

This also means We take care of the house.

Still, Nous prenons soin de la maison is perfectly correct and is common in writing, careful speech, and formal contexts.

Because in this expression, French normally says prendre soin de..., not prendre un soin de...

So:

• correct: prendre soin de quelqu’un / quelque chose
• not normal here: prendre un soin de...

You may sometimes see un soin in other contexts, but that is a different use of the noun. In this sentence, the idiomatic form is simply prendre soin de.