You look at the words les amis and see two separate words. Then you hear a French speaker say them, and it sounds like one flowing sound, lay-zah-mee. That hidden z is called liaison, and it is one of the biggest reasons spoken French sounds so different from the French on the page. The good news is that liaison follows real rules. Once you know them, French audio stops feeling like a guessing game and starts sounding like a language you can actually follow.
What liaison actually is
Liaison happens when a normally silent final consonant jumps onto the next word, but only when that next word starts with a vowel sound. Take les amis. The s in les is silent when the word sits alone. Put it before a word starting with a vowel, and suddenly you pronounce a z sound that bridges the two. The consonant does not quite belong to either word. It acts as a connector, a little ramp from one word to the next.
Written French keeps the words separate, which is why reading French does not prepare you for this. Your eyes see a gap, but French ears do not hear one. Knowing the rules matters for listening practice too. When you expect the link, you stop mishearing it as an extra word, and you can guess which words are coming next.
When you must link
The required cases are easy to memorize because they involve very common word pairs. Link the sound in these situations every time, and you will sound much more natural.
- After articles and numbers: les amis (lay-zah-mee), un enfant (uh-nahn-fahn), deux heures (deuh-zur)
- Between a pronoun and a verb: vous avez (voo-zah-vay), ils ont (eel-zon), nous avons (noo-zah-von)
- After short prepositions like chez and sans: chez elle (shay-zel), sans arrêt (sahn-zah-reh)
- After très and similar adverbs: très utile (tray-zoo-teel)
When you must not link
Just as important are the places where learners wrongly add a link. Native speakers pause here, and a forced liaison can sound odd, overly formal, or even change the meaning.
- After et (and): et un café stays eh-uhn, with no t sound.
- After a singular noun: le chat est noir has no link between chat and est.
- Before an aspirated h: le héros and les haricots keep the h as a silent barrier, so no link.
- At the end of a sentence or before a pause, where nothing follows to link onto.
The aspirated h is the sneakiest one, because it looks like a vowel word in writing. There is no shortcut to memorize them all. You learn le héros and les haricots the same way you learned irregular verbs, one encounter at a time.
Practice it with the news
When you read French news at your level, you can practice this in real time. Pick a short paragraph and mark every spot where a word ending in a silent consonant meets a word starting with a vowel. Read it aloud, then listen to the same sentence on a news site that has audio and check your marks. Start with headlines, since they are short and full of the linking patterns you just learned. After a few weeks you will hear the links without hunting for them, and fast French will finally slow down for you.