I will answer your question regarding my understanding to your used words in conveying your question.
You asked about the clauses, whether dependent or independent, that are frequently occurred within the tenses that are divided into two main types, Past and Present.
The past progressive (to be+ ing verb form)takes place in a dependent status as "When I met my friend Ali, he was being upset." Also, the present progressive has the same status.
LoL you are asking a question that needs a project to cover this question.