A verb is the centerpiece of every clause. There are linking verbs, action verbs, and helping verbs. Unlike a verbal, a verb always has a subject and can be transitive. Verbs are further classified in terms of voice, person, and tense. In English, there are three simple tenses and these are subdivided further.
Simple tenses: Past Present Future
These can be further subdivided into the perfect, progressive, and emphatic:
Past perfect Present perfect Future perfect
Past progressive Present progressive Future progressive
Past emphatic Present emphatic (there is no future emphatic tense)
Greek:
Study chapter 15 in BBG. There are five tenses:
Present Imperfect Future Aorist Perfect
See all the verb endings here.
Hebrew:
Start here. There are two verb forms and seven stems:
Affix form, also called perfect or QTL. Prefix form, also called imperfect or YQTL.