J’ai failli glisser sur le carrelage mouillé de la cuisine.

Because French normally avoids a clash of two vowel sounds. Je becomes j’ before a word that starts with a vowel or silent h, so je ai becomes j’ai.

This is called elision:

• je ai → j’ai
• je aime → j’aime
• je habite → j’habite

Here, failli comes from the verb faillir, which in this pattern means to almost do something or to nearly do something.

So j’ai failli glisser means I almost slipped.

A very common structure is:

• avoir failli + infinitive

Examples:

• J’ai failli tomber. = I almost fell.
• Il a failli oublier. = He almost forgot.

That is the normal grammar pattern for faillir when it means to almost do something.

Structure:

• subject + avoir + failli + infinitive

So:

• j’ai failli glisser
• tu as failli tomber
• elle a failli rire

Even though glisser is the action that almost happened, the conjugated verb is avoir and failli stays as a past participle before the infinitive.

It is the passé composé, one of the main past tenses in French.

Here:

• ai = present tense of avoir
• failli = past participle of faillir

French uses the passé composé here because the sentence refers to a specific event in the past: there was a moment when the speaker nearly slipped.

Because glisser sur is the normal way to say to slip on a surface.

Examples:

• glisser sur le sol
• glisser sur la glace
• glisser sur le carrelage

If you say just glisser, it can simply mean to slip or to slide, but sur tells you what surface caused it.

Carrelage refers to tiling or a tiled surface, especially a tiled floor.

In this sentence, le carrelage mouillé de la cuisine means the kitchen’s tiled floor/surface.

It is not exactly the same as sol, which is the more general word for floor.

• sol = floor in general
• carrelage = tiled flooring / tiling

So French is being a bit more specific here.

Because mouillé describes carrelage, and carrelage is masculine singular: le carrelage.

So the adjective must agree with that noun:

• le carrelage mouillé
• masculine singular → mouillé

If the noun were feminine, it would change:

• la surface mouillée

A common learner mistake would be to think it agrees with la cuisine, but it does not. The wet thing is the carrelage, not the cuisine itself.

Because de la cuisine means of the kitchen or the kitchen’s, so it identifies which tiled floor we mean:

• le carrelage de la cuisine = the kitchen floor / the tiling in the kitchen

If you said dans la cuisine, that would mean in the kitchen, which focuses more on location than possession/specification.

Compare:

• le carrelage de la cuisine = the kitchen’s tiled floor
• j’ai glissé dans la cuisine = I slipped in the kitchen

Both can be correct in different contexts, but here de la cuisine naturally attaches to carrelage.

Because in French, many descriptive adjectives usually come after the noun, and mouillé is one of them.

So:

• le carrelage mouillé not
• le mouillé carrelage

Some adjectives often come before the noun, but many—including most adjectives of physical state like mouillé, cassé, sale, glissant—usually come after it.

Yes. J’ai presque glissé is natural and means something very close to I almost slipped.

But there is a slight nuance:

• J’ai failli glisser strongly emphasizes that the action nearly happened.
• J’ai presque glissé also means nearly, but with presque rather than the verb pattern faillir + infinitive.

Both are common.
J’ai failli glisser often sounds a little more idiomatic and direct for a near-accident.

Yes, but it changes the action slightly.

• glisser = to slip
• tomber = to fall

So:

• J’ai failli glisser = I almost slipped
• J’ai failli tomber = I almost fell

If you want to focus on losing traction on the wet tiles, glisser is the better verb. If you want to focus on the result that nearly happened, tomber works too.

A careful approximate pronunciation is:

zhay fa-yee glee-say sur luh ka-rel-ahzh moo-ee-yay duh la kwee-zeen

A few helpful points:

• J’ai sounds like zhay
• failli sounds like fa-yee
• glisser ends with the -é sound: glee-say
• mouillé sounds like moo-ee-yay
• cuisine sounds like kwee-zeen

In normal speech, French flows smoothly, so the whole sentence is linked together quite fluidly.

Yes, especially in the pattern avoir failli + infinitive.

You will often hear things like:

• J’ai failli tomber.
• On a failli rater le train.
• Elle a failli pleurer.

However, outside this almost did something pattern, faillir is much less common for learners. So the most useful thing to remember is the chunk:

j’ai failli + infinitive = I almost ...