необходи́мо
predicative
impersonal
it is necessary
INF
to do something
необходи́мо ко́нчить рабо́ту в срок
the work must be finished on time, it is necessary to finish the work in time
it is necessary
Ему́ сро́чно необходи́мо верну́ться на ро́дину.
He urgently needs to go back to (his) home country (hometown).