For instance ,which one is correct? And why?

Le numéro de série est marqué en dessous.

Le numéro de série est marqué dessous.

1 Answer 1


One difference is that you can use a complement with "en dessous" ou "sous", whereas you can't with "dessous"; thus, you can say this;

  • le numéro de série est marqué en dessous de/sous la date de fabrication.

These two words are prépositions.

When you use "dessous", which is not a preposition (so you can't use nouns after it) but an adverb, you must specify in the context the thing under which is what you are talking about;

  • La date de fabrication se trouve au dos du couvercle; le numéro de série se trouve dessous. The number is under the date.

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