Je reconnais la voix de Marie.

Because je reconnais is the 1st person singular form of the verb reconnaître in the present tense.

Present tense of reconnaître:

• je reconnais = I recognize
• tu reconnais = you recognize
• il/elle reconnaît = he/she recognizes
• nous reconnaissons = we recognize
• vous reconnaissez = you recognize
• ils/elles reconnaissent = they recognize

So reconnaît goes with il/elle, not je.

Here, reconnaître means to recognize — in other words, to identify something or someone because it is familiar.

So in this sentence, Je reconnais la voix de Marie means that the speaker hears the voice and identifies it as Marie’s.

By contrast, connaître usually means to know / be familiar with:

• Je connais Marie = I know Marie
• Je reconnais Marie = I recognize Marie

A useful shortcut:

• connaître = know
• reconnaître = recognize

In French, nouns usually need an article much more often than in English. So voix normally needs la here.

That is why French says:

• la voix = the voice

Even when English might sometimes sound more natural without an article, French often still requires one.

So:

• Je reconnais la voix de Marie = correct
• Je reconnais voix de Marie = incorrect

de is used here to show possession or relationship.

So:

• la voix de Marie = Marie’s voice / the voice of Marie

This is a very common French structure:

• le livre de Paul = Paul’s book
• la voiture de mon frère = my brother’s car
• la voix de Marie = Marie’s voice

French usually uses de + noun where English often uses 's.

No, not in standard French.

For possession with a noun, French normally uses de, not à:

• la voix de Marie = correct
• la voix à Marie = not standard here

You may sometimes hear à in informal speech with certain expressions, but learners should use de for this kind of possession.

This follows normal French sentence order:

subject + verb + object

So:

• Je = subject
• reconnais = verb
• la voix de Marie = object

That is very similar to English:

• I recognize Marie’s voice

French does not usually reorder this sentence in any special way.

Here, voix is singular.

The word voix is a bit tricky because:

• singular: la voix = the voice
• plural: les voix = the voices

It is spelled voix in both singular and plural. The article tells you whether it is singular or plural:

• la voix = singular
• les voix = plural

voix is pronounced roughly like vwa.

Important points:

• the x is not pronounced
• the oi combination usually sounds like wa

So:

• voix ≈ vwa

This is the same sound pattern you hear in words like:

• moi ≈ mwa
• trois ≈ trwa

A simple approximate pronunciation is:

zhuh ruh-koh-nay la vwa duh ma-ree

A few details:

• Je sounds like zhuh
• reconnais ends with the sound -nay
• la voix = la vwa
• de Marie often sounds like duh ma-ree

In natural speech, de may be very light.

Usually, no major required liaison stands out here in careful standard pronunciation.

For example:

• la voix de Marie does not create a liaison from the x of voix
• the x in voix is silent here

So you would normally hear:

• la vwa de ma-ree

not something like vwa-z-de

Yes. Reconnaître is used for recognizing many kinds of things:

• Je reconnais Marie. = I recognize Marie.
• Je reconnais sa voix. = I recognize his/her voice.
• Je reconnais cette chanson. = I recognize this song.
• Je reconnais l’endroit. = I recognize the place.

So in your sentence, you are recognizing the voice, not necessarily seeing the person.

Yes, if the context makes it clear who sa refers to.

• Je reconnais la voix de Marie = I recognize Marie’s voice
• Je reconnais sa voix = I recognize her voice / his voice

However, sa can mean his, her, or sometimes its, depending on context. If you want to be very clear, la voix de Marie is more precise.

Because Marie is a proper noun, and proper names usually do not take an article in French.

So:

• de Marie = of Marie / Marie’s

That is normal:

• le livre de Paul
• la sœur de Sophie
• la voix de Marie

Some place names and a few special cases do use articles, but personal names like Marie usually do not.

Yes, very naturally.

Even if the meaning has already been given, learners often wonder about the nuance. This sentence often suggests:

• I hear the voice
• I identify it as Marie’s
• I know it is Marie because I recognize the voice

So it is not just abstract recognition of a sound; it often carries the idea I can tell that it’s Marie from the sound of her voice.