You are writing a letter, a professional email, or a report, and doubt arises: should you write “in any circumstance” or “in all circumstances”? This hesitation between singular and plural comes up very often in French. The good news is that both forms are correct. However, the nuance between them deserves some explanation to make an informed choice.
The role of the determiner “toute” versus “toutes” in this expression
To understand why both spellings coexist, we need to look at the word that precedes “circonstance.” It is this word that changes everything.
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With “toute” in the singular, the determiner takes on a value close to “each” or “any.” It refers to the circumstance in a general way, without isolating any particular one. The phrase “he remains calm in any circumstance” means “whatever the circumstance.”
With “toutes” in the plural, the determiner emphasizes all possible situations. “He remains calm in all circumstances” amounts to saying “in all imaginable circumstances.” The plural evokes a concrete plurality of cases.
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This expression works exactly like other constructions of the same type, whatever the circumstances according to France Actus, both singular and plural are accepted. This mechanism can also be seen with “in any occasion” / “in all occasions” or “at any hour” / “at all hours.”
Singular or plural: which form to prefer depending on the context
If both forms are accepted, the choice is not entirely neutral. The level of language and the type of text guide the preference.
The singular in a formal register
In administrative correspondence, legal texts, or careful writing, the singular “in any circumstance” is often perceived as more elegant. It emphasizes abstract generality. A writing guide published by Ça m’intéresse in 2026, regarding the nearby expression “for any information,” confirms this trend: the singular is recommended in a formal register to mark generality.
This stylistic preference is found in fixed phrases. “In all confidence,” “in all simplicity,” “in all frankness”: the singular dominates when the noun expresses an abstract and uncountable notion.
The plural in a context of obligation or exhaustiveness
The plural naturally prevails when one wants to emphasize the diversity of situations. In a debate on road safety reported by Le Dauphiné in August 2026, a political leader called for making helmet use “mandatory, in all circumstances and throughout the territory.” The plural here reinforces the idea that the rule covers every situation without exception.
In everyday language, “in all circumstances” is actually the most common form. If you hesitate and the text does not fall under a particularly formal register, the plural remains a safe choice.
Common mistakes and grammatical traps around “circonstance”
The agreement between “toute” and “circonstance” is the main difficulty, but other traps lurk.
- Forgetting the “s” on both words in the plural: if you choose the plural, “toutes” and “circonstances” both take the plural marker. Writing “in all circonstance” (without the final “s”) is a mistake.
- Confusing “toute” as an adverb and “toute” as a determiner: in “she is all surprised,” “toute” is an adverb meaning “entirely.” In “in any circumstance,” “toute” is a determiner. The grammatical function differs, which explains why the rules of agreement are not the same.
- Adding a hyphen: “in-any-circumstance” does not exist. This phrase is written without a hyphen.
The noun “circonstance” itself is a feminine noun. It refers to a fact, an event, or a condition that accompanies an action. In grammar, it appears in the term “complement circonstanciel,” which specifies the conditions (place, time, manner) under which the verb’s action takes place.
Similar constructions: how to agree “tout” before a feminine noun
The hesitation over “in any circumstance” reflects a broader doubt. Have you noticed that the word “tout” changes form depending on its position in the sentence?
Before a singular feminine noun, “tout” becomes “toute.” Before a plural feminine noun, it becomes “toutes.” Here are the most common constructions:
- “In any freedom” (singular, abstract generality)
- “In all letters” (plural, as we think of all the letters that make up the word)
- “In any case” (singular, fixed phrase)
- “All proportions being equal” (plural, as we compare several proportions)
The logic remains the same as for “circonstance”: the singular emphasizes globality, the plural emphasizes multiplicity. Both are often accepted, but some phrases are fixed in only one form. “In any case” is not written as “in all cases” in common usage, even though the plural form exists in older texts.
The choice between “in any circumstance” and “in all circumstances” does not therefore fall under a strict rule, but rather a stylistic preference. The singular is suitable for careful texts, while the plural is appropriate for common or normative contexts. In both cases, remember to agree “toute(s)” and “circonstance(s)” together: either both in the singular or both in the plural. That is the only mistake to avoid.