Ce bruit m’embête, alors je ferme la fenêtre.

Because bruit is a masculine singular noun, and it begins with a consonant sound.

French demonstratives are:

• ce for masculine singular before most consonants
• cet for masculine singular before a vowel or silent h
• cette for feminine singular
• ces for plural

So:

• ce bruit = this/that noise
• cet arbre = this/that tree
• cette fenêtre = this/that window

It can mean either one. In French, ce / cet / cette / ces can mean both this and that depending on context.

So ce bruit could mean:

• this noise
• that noise

If French speakers want to make the contrast clearer, they can add:

• ce bruit-ci = this noise
• ce bruit-là = that noise

But in normal speech, just ce bruit is very common.

M’embête means bothers me, annoys me, or is bothering me.

It comes from the verb embêter, which means:

• to bother
• to annoy
• to be a nuisance to

In the sentence:

• Ce bruit m’embête
  literally: This noise bothers me

The m’ stands for me.

So the structure is:

• ce bruit = subject
• m’ = indirect/object pronoun meaning me
• embête = bothers / annoys

Because French uses elision before a vowel sound.

Me becomes m’ before a verb beginning with a vowel or silent h:

• me + embête → m’embête
• me + appelle → m’appelle
• me + écoute → m’écoute

This is done for smoother pronunciation.

Because in French, object pronouns usually go before the conjugated verb.

Compare:

• English: This noise bothers me
• French: Ce bruit m’embête

Other examples:

• Il me voit = He sees me
• Tu l’aimes = You love him / her / it
• Nous vous aidons = We help you

This often feels unusual to English speakers because English usually puts the object pronoun after the verb.

Because je ferme is the conjugated present tense form of fermer.

The infinitive is:

• fermer = to close

But after je, you need the conjugated form:

• je ferme = I close / I am closing

For a regular -er verb like fermer, the present tense is:

• je ferme
• tu fermes
• il/elle ferme
• nous fermons
• vous fermez
• ils/elles ferment

So je fermer would be ungrammatical here.

Here, alors means so, therefore, or as a result.

The logic is:

• Ce bruit m’embête = That noise bothers me
• alors je ferme la fenêtre = so I close the window

So alors links cause and result.

Be aware that alors can also mean then in other contexts, depending on tone and situation.

French often uses the definite article (le, la, les) where English might use a possessive like my.

So French may say:

• je ferme la fenêtre
  literally: I close the window

Even if in English you might naturally say:

• I close my window

French often prefers the article when the ownership is obvious from context.

Here, la fenêtre simply means the window, and the sentence assumes the relevant window is clear from the situation.

It is the present tense, and in French the present tense often covers both:

• I close the window
• I am closing the window

So je ferme la fenêtre can mean either one, depending on context.

French does have ways to emphasize an action in progress, but the simple present is very often enough.

Because fenêtre is a feminine singular noun.

In French, every noun has grammatical gender, so you must learn the noun together with its article:

• la fenêtre = the window

That is why you say:

• je ferme la fenêtre

and not:

• je ferme le fenêtre

The article must match the noun’s gender.

A rough pronunciation guide is:

Suh brwee m ahm-bet, ah-lor zhuh ferm luh fuh-netr.

A few key points:

• ce sounds roughly like suh
• bruit sounds like brwee
• m’embête has the m’ attached directly to the next word
• alors sounds roughly like ah-lor
• je sounds like zhuh
• fenêtre ends with a light tr sound

Also, in natural speech, French flows smoothly, so the sentence may sound more connected than the written words suggest.

Yes. Depending on the nuance, French speakers might also say:

• Ce bruit me gêne = This noise bothers/disturbs me
• Ce bruit m’agace = This noise irritates me
• Ce bruit me dérange = This noise disturbs me

Compared with these:

• embêter is common and conversational
• gêner can sound a bit milder or more like disturb/inconvenience
• agacer is more like irritate
• déranger often suggests disturbing someone or interrupting comfort

So m’embête is a natural, everyday choice here.