Usage Note
Necesario follows a standard -o/-a/-os/-as pattern. It commonly appears in the impersonal construction es necesario + infinitivo ('it is necessary to…'). The adverb form is necesariamente. Its near-synonym preciso is slightly more formal, while hace falta is the colloquial equivalent in spoken registers.
Examples
"Es necesario llevar el pasaporte."
Natural Translation
It is necessary to carry the passport.
Related Words
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