French Phrase
On doit sécuriser tout ce qui est dehors.
Meaning
The sentence states that there is an obligation to make safe every object, person or area that is located outside. It is a generic statement, so 'on' can be understood as 'we' or 'people in general'.
When to use
Use this phrase when discussing safety measures for outdoor spaces—e.g., before a party, at a construction site, or when giving security instructions for a public event.
✦Grammar Breakdown
Ondoitsécurisertoutcequiestdehors.
On (impersonal pronoun)
Used like 'we' or 'one' to make a general statement; often interchangeable with 'nous' in informal speech.
doit (devoir)
Third‑person singular present of devoir, expressing obligation or necessity.
sécuriser (infinitive)
Verb meaning 'to secure, to make safe'; follows devoir in the construction devoir + infinitive.
tout ce qui
Relative construction meaning 'everything that'; 'tout' agrees with the singular verb that follows.
est (être)
Third‑person singular present of être, linking the subject 'tout ce qui' with the location 'dehors'.
dehors (adverb of place)
Means 'outside' or 'outdoors'; can be replaced by 'à l'extérieur' for a slightly more formal tone.
🗨In Conversation
On doit sécuriser tout ce qui est dehors avant la soirée.
We need to secure everything that is outside before the party.
Oui, je vais installer des caméras autour du jardin.
Yes, I’ll install cameras around the garden.
✕Common Mistakes
On doit securiser tout ce qui est dehors.
The verb needs an acute accent on the first 'e' – sécuriser.
On doit sécuriser tout ce qui sont dehors.
The relative clause 'tout ce qui' is singular, so the verb must be singular (est), not plural (sont).
On doit sécuriser tout ce qui est dehorss.
Do not add an extra 's' – the correct adverb is 'dehors', not 'dehorss'.
↔Alternatives
Il faut sécuriser tout ce qui est à l'extérieur.
It is necessary to secure everything that is outdoors.
Nous devons protéger tout ce qui se trouve dehors.
We must protect everything that is outside.
Il est indispensable de sécuriser tout ce qui se trouve à l'extérieur.
It is indispensable to secure everything that is outside.
Cultural Tip
In French, 'dehors' is the everyday word for 'outside', while 'à l'extérieur' sounds a bit more formal and is often used in written instructions. The impersonal 'on' is very common in spoken French to express collective responsibility, but in formal writing you might replace it with 'nous' or 'il faut'.