Breakdown of Trebuie să clarificăm cine face rezervarea astăzi.
cine
who
face
to do, to make
să
to (subjunctive marker)
astăzi
today
trebui
to have to / to be needed (with a dative: to need)
clarifica
to clarify
rezervarea
the reservation
Elon.io is an online learning platform
We have an entire course teaching Romanian grammar and vocabulary.