French prepositions

en vs. dans: how to choose

Both translate as 'in', but 'en' measures duration/category while 'dans' measures a future point or a physical container.

The decision: Already happened, stating how long it took? → en. Still ahead of you, counted from now? → dans.

The choices at a glance

ChooseWhen to use itPattern and example
en How long something took, or a category/material. Il a fini en deux heures.
dans How far in the future, or inside a physical container. Il arrive dans deux heures.

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