Ces fleurs me rendent heureux.

Ces means these or those. French uses the same plural demonstrative adjective for both.

So:

• ces fleurs = these flowers / those flowers

Context tells you which one sounds more natural in English.

Also note:

• ce = this/that (masculine singular)
• cette = this/that (feminine singular)
• ces = these/those (plural for both genders)

Because fleurs is plural, French uses ces.

Because the sentence is talking about more than one flower.

• la fleur = the flower
• les fleurs = the flowers

The -s marks the plural in writing. In pronunciation, that final -s is normally silent, so fleur and fleurs sound the same on their own.

In French, object pronouns usually come before the conjugated verb.

So:

• me = me
• rendent = make / render

French word order:

• Ces fleurs me rendent heureux.

Literal structure:

• These flowers me make happy.

Natural English:

• These flowers make me happy.

This is very normal in French:

• Il me voit. = He sees me.
• Tu me comprends. = You understand me.

Rendent is the 3rd person plural form of the verb rendre.

Here, rendre means something like:

• to make
• to render
• to cause someone to become

So:

• Ces fleurs rendent... = These flowers make...

It is plural because the subject is ces fleurs, which is plural.

A few forms of rendre in the present tense:

• je rends
• tu rends
• il/elle rend
• nous rendons
• vous rendez
• ils/elles rendent

French often uses the pattern:

rendre + object + adjective

to mean:

to make someone/something + adjective

So:

• me rendre heureux = to make me happy
• te rendre triste = to make you sad
• le rendre fou = to make him crazy

This is a very common structure in French.

Because heureux agrees with the person described as happy, not with fleurs.

In this sentence, heureux describes me — the speaker.

So:

• if the speaker is male: heureux
• if the speaker is female: heureuse

Compare:

• Ces fleurs me rendent heureux. = These flowers make me happy.
  (speaker is male)

• Ces fleurs me rendent heureuse. = These flowers make me happy.
  (speaker is female)

It does not agree with fleurs, even though fleurs is feminine plural, because the flowers are not the ones who are happy.

Because heureux is not describing fleurs. It is describing me.

The flowers are the subject doing the action, but the adjective tells us the result for the object:

• Ces fleurs → the things causing the effect
• me → the person affected
• heureux → describes that person

So the adjective agrees with the affected person, not the subject.

Yes. Heureux is an adjective meaning happy.

In this sentence, it works as an object complement or result adjective: it describes the state that the object (me) ends up in because of the action.

So the pattern is:

subject + object pronoun + rendre + adjective

Example:

• Cette musique me rend nostalgique. = This music makes me nostalgic.
• Le bruit me rend nerveux. = The noise makes me nervous.

No. No article is needed here.

After rendre, French often puts an adjective directly:

• me rendre heureux
• la rendre fière
• les rendre jaloux

This is similar to English:

• make me happy
• not make me a happy

So heureux is correct on its own.

A careful approximate pronunciation is:

say flur muh rahnd uhr-uh

A more French-like IPA transcription is:

/se flœʁ mə ʁɑ̃d‿øʁø/

A couple of useful pronunciation notes:

• ces sounds like say
• fleurs has a French r
• me is often a light muh
• rendent ends with a silent -ent in this verb form
• there is usually a liaison in rendent heureux, so the final sound links to the next word

Yes, but it is not exactly the same structure.

• Ces fleurs me rendent heureux = These flowers make me happy.
• Ces fleurs me font plaisir = These flowers give me pleasure / These flowers make me happy in a slightly different way.

Both are natural, but rendre heureux focuses more directly on the emotional result: happy.

Yes. French does not usually make that distinction in the determiner itself.

So ces fleurs can mean:

• these flowers
• those flowers

If French needs to be more explicit, it can add -ci or -là:

• ces fleurs-ci = these flowers
• ces fleurs-là = those flowers

But in many everyday sentences, plain ces is enough.

The structure is:

Ces fleurs + me + rendent + heureux

Which breaks down as:

• Ces fleurs = subject
• me = direct object pronoun
• rendent = verb
• heureux = adjective describing the result for the object

So the pattern is:

Subject + object pronoun + rendre + adjective

That is a very useful pattern to remember in French.