in croatian, there are seven grammatical tenses. they can be divided in two ways: by the time they take place in and by their complexity. simple tenses consist of only 1 word (simple tenses are aorist, imperfect, and present) while complex tenses consist of 2 or even 3 words (complex tenses are pluperfect, perfect, first future, second future) because they also consist of auxiliary verbs. also, some grammatical tenses cannot be formed with both grammatical aspects, they work with only one aspect.