Denetmen bugün muhasebe bölümünde olsa gerek.
The auditor must be in the accounting department today.
Breakdown of Denetmen bugün muhasebe bölümünde olsa gerek.
olmak
to be
bugün
today
gerek
necessary
bölüm
section / department
Questions & Answers about Denetmen bugün muhasebe bölümünde olsa gerek.
Why use olsa gerek for "must be" instead of olmalı?
While olmalı can also mean "must be" as a logical deduction, it frequently implies obligation ("has to be" or "should be"). By using the -(y)sA gerek structure (ol-sa gerek), you make it 100% clear that you are making a strong guess based on evidence ("I deduce they are there"), rather than stating a rule about where they are required to be.
Why is there an extra -n- and -ü- in bölümünde? Why not just say muhasebe bölümde?
Muhasebe bölümü (accounting department) is a noun compound, which requires the possessive suffix -ü on the second word. Whenever you add a spatial case marker (like the locative -de for "in") to a noun that ends with a third-person possessive suffix, Turkish grammar requires the buffer consonant -n-. So it breaks down as bölüm (department) + -ü (compound suffix) + -n- (buffer) + -de (in).
Could I use olsa gerekir instead of olsa gerek at the end of the sentence?
Yes, you can. Both olsa gerek and olsa gerekir are grammatically correct and mean the exact same thing in this context. However, dropping the aorist ending and just using the bare word gerek is an extremely common, fixed phrase in everyday Turkish for this specific type of deduction.