Common Mistakes in French: How to Avoid Them Easily

We all make mistakes, from the beginner to the seasoned French speaker. A forgotten agreement, a preposition gone astray, a moment’s hesitation between “a” and “à”: it’s almost always the same slip-ups that keep coming back. They don’t ruin your life, but they do sometimes leave a bad impression, in writing as much as in speech.

French piles up a great many rules, each with its share of exceptions. The good news is that most of these mistakes follow simple rules, easy to remember once you’ve understood them. Spotting the errors that crop up most often is already half the journey. The rest comes down to a little method and regular practice.

In this guide, you’ll find the mistakes that cause the most trouble, sorted by family: agreements, homophones, grammar, prepositions, anglicisms and vocabulary mix-ups. Each case comes with a concrete example and a clear correction, so you’ll know what to do the next time doubt creeps in.

Why do we always make the same mistakes?

With every sentence, French demands a series of small calculations: gender, number, tense, agreements. When you write quickly, you end up cutting corners on some of them. In speech, the fast pace makes it worse, since there’s no time to proofread. As a result, certain slip-ups settle in and become automatic habits that are hard to shake off, even after years of practice.

Another reason lies in the gap between what you hear and what you write. Many words are pronounced the same but spelled differently, which multiplies the hesitations. Habit plays a part too: after reading a faulty turn of phrase in enough messages, you end up believing it’s correct. To reverse the trend, nothing beats regular exposure to well-written texts, along with a bit of method to progress in writing.

The agreement mistakes that trip everyone up

Agreement errors top the list of the most widespread mistakes, and native speakers are no exception. The trickiest point remains the agreement of the past participle. With the auxiliary “être”, it always agrees in gender and number with the subject: “les pompiers sont venus”, never “venu”. With “avoir”, it only agrees if the direct object is placed before the verb.

An example helps fix the rule: “les lettres que j’ai écrites” takes an agreement, because “les lettres” comes before the verb. On the other hand, “j’ai écrit des lettres” stays invariable, since the object follows. To ingrain this reflex, it’s better to practise on concrete cases than to revise the rule in the abstract. A few reading comprehension exercises often do more good than a long lesson.

Agreements with “la plupart” and “la majorité”

Here’s a case that throws a lot of people. After “la plupart”, “la majorité” or “une partie de”, the agreement is made with the complement, not with the collective word. So you write “la plupart des invités sont arrivés”, in the plural. Likewise, “un espèce de” is wrong: “espèce” is feminine, so it should be “une espèce de”. These subtleties are picked up over the course of your reading and by revising the basics of grammar.

The everyday spelling mistakes worth knowing

Some words are misspelled nearly every time. “Accueil” is written with the “u” before the “e”, not “acceuil”: the rule holds for the whole family, like “cueillir” or “orgueil”. “Absence” takes only one “s” and no hidden “c”, contrary to the faulty spellings “abscence” or “absense”. These words deserve to be memorised once and for all.

Another common example, “chiffre d’affaires” always keeps its final “s”, even in the singular. The expression “au temps pour moi” is spelled this way, and not “autant pour moi” as it’s often read. These spellings obey no obvious logic: only the habit of seeing them written correctly eventually fixes them in your memory.

Homophones, those twin words that deceive

Pronounced the same way but spelled differently: that’s the whole trap of homophones. “a” and “à”, “ou” and “où”, “ces” and “ses”, “leur” and “leurs” sound alike to the ear and sow doubt on the page. The way around it comes down to a trick: replace the word with another to test the sentence. If “c’est” can become cela est, that’s the right spelling.

Same logic for the other pairs. You replace “a” with “avait”: if the sentence holds, it’s the verb avoir, so no accent. “Ou” becomes “ou bien” when it expresses a choice; otherwise, “où” indicates place. “Ses” marks possession, “ces” points to what you’re showing. Once these reflexes are in place, they spare you countless mistakes in professional writing.

These mix-ups come at a high cost during a written exam, where every mistake counts. So it’s better to hunt them down before the big day, especially if you’re aiming for a diploma. DELF preparation benefits from including targeted work on these traps, since they turn up in almost every piece of writing.

The most stubborn grammar mistakes

Some errors survive years of schooling. The most frequent one affects the subjunctive after “il faut que”, “bien que” or “pour que”. You often hear “il faut que tu fais attention”, whereas the correct form is “il faut que tu fasses attention”. The subjunctive mood is required after these expressions, without any possible exception.

“Si j’aurais”: the misplaced conditional

Another all-time classic, the confusion between the imperfect and the conditional after “si”. The sentence “si j’aurais su, je ne serais pas venu” sets many French speakers’ teeth on edge. The rule is clear: after “si”, you never use the conditional. You write Si j’avais su, je ne serais pas venu. This turn of phrase gives your level away at once, so you might as well correct it quickly.

To this we can add “après que”, followed by the indicative and not the subjunctive: “après qu’il a fini”, not “après qu’il soit fini”. Likewise, “malgré que” doesn’t exist in careful French; “bien que” is preferred instead. Remembering these few constructions clears up a good part of the common grammar mistakes, and makes your expression instantly more assured.

Conjugation itself holds a few traps. You hear “ils croivent” for “ils croient”, or “ils voyent” for “ils voient”. These invented forms come from a false analogy with other verbs. The best remedy is still to memorise irregular verbs one by one, until the right form comes without thinking.

Confusing “-é” and “-er”, the number one error

This is probably the most widespread mistake in writing. Should you write “je vais manger” or “je vais mangé”? The rule can be tested in a second: replace the verb with a third-group verb like “prendre”. If “prendre” sounds right, it’s the infinitive in “-er”; if “pris” fits, it’s the past participle in “-é”. “Je vais prendre” works, so it’s “je vais manger”.

The trap returns as soon as one verb follows another, or after a preposition like “pour”, “sans” or “de”. You write “il a fini de travailler”, never “de travaillé”. Conversely, “le travail est terminé” takes an “é”, because it really is the participle. This replacement trick settles almost every case, even in long sentences.

Prepositions, a never-ending puzzle

Should you say “à Paris” or “en Paris”? “Au Canada” or “en Canada”? Prepositions before place names rank among the most frequent errors. The basic rule stays simple: à for cities, “en” for feminine countries, “au” for masculine countries, “aux” for plural countries. Thus: à Lyon, en Italie, au Brésil, aux États-Unis.

The verb “aller” follows the same logic. “Je vais sur Paris” is heard more and more, but remains incorrect: you go “à Paris”, not “sur Paris”. The preposition “chez” poses another problem. It’s used before a person or a profession, never for a physical place. You say “chez le médecin” and “à la boulangerie”, but “chez la boulangerie” is a mistake.

Some verbs call for a specific preposition. “Dépendre de”, “penser à”, “se souvenir de” aren’t built at random. “Il dépend de moi” is correct, “il dépend sur moi” is not. The same vigilance applies to “se rappeler”, which is used without “de”: on se rappelle quelque chose, but on se souvient de quelque chose. These nuances are learned above all through use.

Pleonasms and phrasings to avoid

A pleonasm repeats an idea already contained in a word. “Monter en haut”, “descendre en bas”, “au jour d’aujourd’hui” or “voire même” weigh a sentence down without adding anything. You gain clarity by cutting them: “monter” is enough, “aujourd’hui” needs no reinforcement. These phrasings sometimes slip by in speech, but clearly jar in writing.

Other formulas are better replaced. “Par contre” is faulted for its casual feel; “en revanche” sounds more polished in a formal text. “Des fois” is better turned into “parfois”. These choices don’t change the meaning, but they refine the register and give an impression of command, especially in a letter or a report.

The anglicisms that weigh your writing down

English creeps in everywhere, and some borrowings have no place in careful writing. “Checker” is a poor stand-in for “vérifier”, “mail” gives way to “courriel”, “planning” to “emploi du temps”. In a message between friends, no one takes offence. In a professional setting, it’s better to use a French equivalent, clearer for everyone.

The word “opportunité” is a good illustration of the shift. In proper French, it refers to the timeliness of something, not an occasion. “Saisir une opportunité” in the sense of “saisir une occasion” comes from English. This kind of calque often goes unnoticed, but a demanding reader spots it. Adapting your vocabulary to the register remains the best guarantee of being understood without a slip.

Common vocabulary mix-ups

Many mistakes come from two similar words used one for the other. “Amener” concerns people, “apporter” objects: on amène un ami, on apporte un gâteau. “Visiter” applies to places, not people: on visite un musée, but on rend visite à ses parents. These distinctions may seem minor, but they make all the difference, in writing as much as in speech.

The pair “poser” and “demander” often trips people up. You don’t “demander une question”, you pose it; “demander” suits a favour or a piece of information. Likewise, “se rappeler” is built without a preposition, whereas “se souvenir” calls for “de”. Once acquired, these little automatic habits make your expression more natural and steer you clear of clumsy phrasings.

Two other pairs regularly mislead. “Censé” means “supposé” (“il est censé venir”), while “sensé” means “raisonnable” (“un projet sensé”). “Davantage” as one word expresses quantity (“j’en veux davantage”), not to be confused with “d’avantage” (“il n’a pas d’avantage”). These couples are told apart only by the meaning intended in the sentence.

The mistakes that mostly slip into speech

In speech, the pace brings out mistakes you’d avoid in writing. A great classic concerns forbidden liaisons: after “et”, you never link with the following word. You say “un garçon et une fille”, without sounding the “t”. Many speakers also make one liaison too many, out of over-eagerness, which is just as noticeable.

Pronunciation holds other pitfalls. Many final letters stay silent, and trying to pronounce them all sounds artificial. Casual phrasings also come across poorly in careful speech: “tu sais c’est qui” becomes “tu sais qui c’est” in an indirect question. Listening to yourself speak, even recording yourself, helps you spot these reflexes and correct them little by little.

Which tools and methods to correct your mistakes?

Spotting your errors takes method and good reflexes. Reading aloud remains the most effective trick: hearing your sentence, you immediately sense what’s off. Correctors like Antidote, Cordial or Scribens are genuinely useful too, provided you don’t trust them blindly. They sometimes miss the context and the subtle agreements.

The table below compares the main approaches, with their strengths and their limits. None is enough on its own: real progress comes from combining them, a reliable corrector for the first pass, then a human read-through for everything the machine lets slip.

One last method proves its worth: keeping a short list of your recurring mistakes. By noting the phrasings that trip you up, you create a personal reminder, far more useful than a general rule. Rereading this notebook before an important piece of writing keeps you from falling into the same traps, over and over.

What to take away

Avoiding common mistakes in French is not a matter of talent, but of consistency. Agreements, homophones, prepositions, anglicisms: each family of mistakes follows rules you retain through practice. Taking the time to proofread, testing your doubts with a simple trick, relying on a corrector without trusting it blindly: these habits are enough to correct most slip-ups.

The rest comes with exposure to the language. The more you read and write, the more the good reflexes settle in, until the correct form comes effortlessly. A mistake is never serious if it serves as a lesson. Dare to correct, adjust, start again: it’s the best way to move forward, and no one escapes it, not even the best.

Anthony FLE