Cette pièce est calme.

Because pièce is a feminine singular noun.

French demonstratives change to match the noun:

• ce = masculine singular
• cet = masculine singular before a vowel or mute h
• cette = feminine singular
• ces = plural

So:

• ce livre = this book
• cet hôtel = this hotel
• cette pièce = this room
• ces livres = these books

Since pièce is feminine, cette is the correct form.

Here, pièce means room.

This word can have several meanings in French depending on context, such as:

• room
• piece
• play (as in a theater play)

In Cette pièce est calme, the adjective calme makes it clear that pièce means a room. A room can be quiet or peaceful, so that reading fits naturally.

You usually learn the gender together with the noun.

So instead of learning just pièce, it is best to learn:

• une pièce

That tells you it is feminine.

There is not always a perfect rule for guessing gender from spelling, so memorizing nouns with un or une is a very helpful habit.

Est is the third-person singular form of the verb être (to be) in the present tense.

The subject is cette pièce = this room, which is singular, so you use est:

• je suis = I am
• tu es = you are
• il/elle/on est = he/she/it is
• nous sommes = we are
• vous êtes = you are
• ils/elles sont = they are

So Cette pièce est calme literally follows the pattern:

This room is calm/quiet.

Because some French adjectives have the same spelling in the masculine and feminine singular.

Calme is one of them:

• un homme calme
• une femme calme
• un endroit calme
• une pièce calme

So even though pièce is feminine, calme stays calme.

In the plural, you usually add -s:

• des pièces calmes

It can suggest both, but for a room, English often translates it more naturally as quiet or peaceful.

So depending on context, Cette pièce est calme could mean:

• This room is quiet.
• This room is peaceful.
• This room is calm. (less common in everyday English, but possible)

French often uses calme for places that are not noisy, stressful, or busy.

Because here calme is not directly attached to the noun inside the noun phrase. It comes after the verb être and describes the subject.

This structure is:

subject + être + adjective

So:

• Cette pièce est calme.
• La voiture est rouge.
• Le café est bon.

This is the same basic idea as English:

• The room is quiet.
• The car is red.
• The coffee is good.

Yes, but the meaning changes slightly.

• Cette pièce est calme = This room is quiet
• La pièce est calme = The room is quiet

So the difference is the same kind of difference as this versus the in English.

Use cette when you want to point out a specific room as this one.

A simple approximate pronunciation is:

set pyess eh kalm

A slightly more accurate breakdown:

• cette ≈ set
• pièce ≈ pyess
• est ≈ eh
• calme ≈ kalm

A few helpful notes:

• pièce has a y sound at the start: pyess
• the final e in cette is not pronounced
• the final e in calme is not pronounced
• calme ends with an audible l sound

Not really a major one to worry about here.

You would normally say the sentence smoothly, but there is no famous required liaison like in:

• les amis
• vous avez

In Cette pièce est calme, just focus on pronouncing each word clearly and linking them naturally in normal speech.

Yes. Calme can describe both people and places.

For example:

• Il est calme. = He is calm.
• Elle est calme. = She is calm.
• Le quartier est calme. = The neighborhood is quiet.
• Cette pièce est calme. = This room is quiet.

So the exact English translation depends on what is being described:

• for a person: usually calm
• for a place: often quiet or peaceful

Because cette already works as a determiner.

In French, you normally do not combine a demonstrative like ce/cet/cette/ces with un/une/le/la/les.

So you say:

• cette pièce = this room

not:

• la cette pièce
• une cette pièce

English works the same way:

• this room not
• the this room

The plural would be:

Ces pièces sont calmes.

Changes:

• cette → ces
• pièce → pièces
• est → sont
• calme → calmes

So:

• Cette pièce est calme. = This room is quiet.
• Ces pièces sont calmes. = These rooms are quiet.