Learn Turkish: Üniversite kaydını bugün yapacaksa pasaport lazım. - If she is going to do her university registration today, a passport is necessary.

It combines the verb root yap- (do), the future tense suffix -acak (will / is going to), and the conditional suffix -sa (if). This creates the meaning "if [subject] plans to do" or "if [subject] will do".

How do we know it means "if SHE is going to do" and not "if YOU are going to do"?

The ending of yapacaksa tells us the subject. The third person (he/she/it) has no personal suffix after the conditional -sa. If it meant "if you are going to do", it would have the "you" suffix -n at the end, making it yapacaksan.

What are all the suffixes on the word kaydını?

The root is kayıt (registration). The ı in the second syllable drops when adding a vowel, making it kayd-. The first -ı makes the noun compound üniversite kaydı (university registration). Then we add the buffer -n-, and the final -ı is the accusative case because the registration is the specific direct object being "done".

Why doesn't the sentence end with a verb?