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non lasci

don't let/leave

→ non
phrase Uncommon #20,530
don't let/leave Usually addressed formally to one person (Lei) as an imperative: “don't let” or “don't leave.” It can also occur as the present subjunctive in subordinate clauses, such as “È meglio che non lasci Santiago” (“It's better that you don't leave Santiago”).
IT: Non lasci aperta la porta.
EN: Don't leave the door open.

Non lasci entrare il cane.

Don’t let the dog in.

Assicurati che Mary non lasci la sua stanza.

Make sure Mary doesn’t leave her room.

Non lasci la stanza.

Don't leave the room.

Non lasci vincere Tom.

Don't let Tom win.

Non lasci i libri della biblioteca qui.

Don't leave the library books here.

Non lasci libri qui.

Don't leave books here.

Non lasci dormire Tom.

Don't let Tom sleep.

Non lasci la camera.

Don't leave the room.

Non lasci prove.

Don't leave any evidence.

Non lasci i libri della biblioteca in questa stanza.

Don't leave the library books in this room.

Non lasci le cose fatte a metà.

You don't leave things half-done.

È meglio che non lasci Santiago.

It is better not to leave Santiago.

— Una donna fantastica (2017)

Non lasci il motore acceso.

Don't leave the engine running.

Non lasci mai fare niente a nessuno.

You never let anyone do anything.