Hello Kali
The basic form of English verbs is a bare infinite, ie., the form you use for present-tense plural-person.
Intensive verbs are those you use in describing what the subject is or what the subject is like. For example, "is" in "He is a student" or "look" in "She looks young" is an intensive verb. Extensive verbs are those you use what the subject is doing. "Run" in "He runs fast" or "love" in "He loves me" is an extensive verb.
Mono-transitive verbs are verbs that take only one object. "Love" in "He loves me" is a mono transitive verb. Di-transitive verbs are verbs that take two objects. "Give" in "He gave me a book" is a di-transitive verbs. Complex transitive verbs are verbs that take one object and a complement of the object. "Call" in "They called him John" is a complex transitive verb.
paco