French Prepositions of Time: How to Use En, Dans, Pendant, and Pour

French prepositions of time are one of the most searched grammar topics for a reason. En, dans, pendant, and pour all translate roughly to 'in' or 'for' in English, but they are not interchangeable, and choosing the wrong one changes the meaning of your sentence completely.

The good news: each preposition follows a consistent logic. Once you understand what each one is actually doing, the choice becomes predictable. This guide gives you the rules, the patterns, and enough examples to make them stick.

Why French Prepositions of Time Are Confusing for English Speakers

English uses 'in' and 'for' to cover a wide range of time relationships. French splits those meanings across four separate words. There is no single trick that maps them to English. You have to learn what each one expresses, not just what it translates to.

The four prepositions each answer a different question. En and dans both relate to duration or a point in time, but they point in different directions. Pendant and pour both relate to a length of time, but one is completed and one is planned. Keep that frame in mind as you read the sections below.

En: Duration or a Named Time Period

En has two main uses with time. First, it expresses how long something takes to be completed. Second, it introduces a named time period such as a month, season, or year.

• Il a lu le livre en deux heures. (He read the book in two hours, meaning it took two hours.)
• Je peux finir ça en dix minutes. (I can finish that in ten minutes.)
• En été, il fait très chaud à Lyon. (In summer, it is very hot in Lyon.)
• Elle est née en 1992. (She was born in 1992.)
• Nous partons en mars. (We are leaving in March.)

Notice that en with a duration always implies completion. Something gets done within that window of time. En with a named period (year, month, season) is simply a label for when something happens.

Dans: A Future Point in Time

Dans means 'in' in the sense of 'from now.' It marks when something will start or happen, counting forward from the present moment. It is almost always used with future or near-future contexts.

• Il arrive dans dix minutes. (He is arriving in ten minutes, meaning ten minutes from now.)
• Je commence le cours dans une semaine. (I start the course in one week.)
• Dans deux ans, je serai bilingue. (In two years, I will be bilingual.)

The key contrast with en: dans tells you when something begins; en tells you how long something takes. 'Je ferai ça dans une heure' means I will do it starting in one hour. 'Je ferai ça en une heure' means it will take me one hour to do it.

En vs Dans: A Direct Comparison

Pendant: A Completed or Ongoing Duration

Pendant means 'for' in the sense of a span of time that has already happened or is happening right now. It emphasizes the length of the period without implying a specific end goal.

• J'ai habité à Paris pendant trois ans. (I lived in Paris for three years.)
• Elle a travaillé pendant huit heures sans pause. (She worked for eight hours without a break.)
• Pendant les vacances, on ne travaille pas. (During the holidays, we do not work.)

Pendant can also translate as 'during' when followed by a noun event rather than a number. 'Pendant le film' means 'during the film.' This is a common use that surprises learners who only know it as 'for.'

Pour: Planned or Intended Duration

Pour with time expresses how long something is intended or expected to last. It often appears in contexts of travel, plans, or arrangements. The duration is projected, not confirmed as completed.

• Je pars pour deux semaines. (I am leaving for two weeks, meaning that is the plan.)
• Elle est venue pour trois jours. (She came for three days, as in she planned to stay three days.)
• Il a loué un appartement pour six mois. (He rented an apartment for six months.)

Pendant and pour are often confused because both translate as 'for' in English. The difference: pendant describes a duration that actually happened or is happening; pour describes a duration that is planned or intended. 'J'ai étudié pendant deux heures' means you actually studied. 'J'étudie pour deux heures' sounds odd in French because you would normally use pendant unless you are emphasizing a planned block of time.

Pendant vs Pour: Side by Side

Quick Reference: All Four Together

Common Mistakes to Avoid

1. Using 'dans' when you mean 'en': 'Je fais ça dans dix minutes' means you will start in ten minutes. 'Je fais ça en dix minutes' means it takes ten minutes. Both are correct, but they say different things.
2. Using 'pour' for a completed past duration: Say 'J'ai vécu à Lyon pendant deux ans,' not 'pour deux ans,' unless you are emphasizing a planned arrangement.
3. Forgetting that 'en' introduces months and seasons: English uses 'in March' and French uses 'en mars.' The same word that means 'in two hours' also handles months.
4. Translating 'for' directly as 'pour': In most time contexts, 'for' is pendant, not pour. Pour is for intended or planned durations.

How to Practice These Until They Stick

Grammar rules only become automatic through repeated, contextual exposure. A few approaches that work well for this specific challenge:

• Write five sentences about your own day using each preposition. Personal sentences are easier to remember.
• When you read or listen to French, flag every time you see en, dans, pendant, or pour used with time and check whether it matches the rule.
• Drill minimal pairs: practice the en/dans contrast and the pendant/pour contrast separately before mixing them.
• Use spaced repetition to review example sentences, not just abstract rules. A vocabulary and phrase review tool that lets you add your own sentences is especially useful here.

If you want to move through grammar like this systematically by level, the structured lesson paths on Fréquence introduce grammar in context rather than as isolated rules, which makes the distinctions easier to internalize.

FAQ

What is the difference between 'en' and 'dans' in French time expressions?

En expresses how long something takes (en deux heures) or names a time period like a month or season (en mars, en été). Dans expresses a future point counted from the present moment (dans deux heures means two hours from now). They can look similar but they answer different questions.

When do you use 'pendant' vs 'pour' in French?

Pendant is for a duration that actually happened or is happening right now. Pour is for a duration that is planned or intended. If the time has already passed, use pendant. If you are talking about a trip you are about to take or an arrangement you have made, use pour.

Can you use 'pour' in the past tense in French?

Yes, but with a specific meaning. 'Elle est venue pour trois jours' in the past means she came with the intention of staying three days. It does not confirm she actually stayed three days. If you want to say she stayed three days in fact, use pendant: 'Elle est restée pendant trois jours.'

How do you say 'in January' or 'in summer' in French?

Use en for months and most seasons: en janvier, en été, en automne, en hiver. The exception is spring: 'au printemps,' which uses the contraction of à + le. This is one of the small irregularities worth memorizing separately.

Fréquence (frequence.academy) covers grammar topics like this inside level-specific lesson paths that go from A1 through C1. The entire first unit, which is 11 lessons, is free and requires no credit card to access. If you want more free French content alongside the lessons, follow @frequenceacademy on Instagram and YouTube, where new tips go up regularly.