I wrote = Simple Past Tense -We refer or call or tell others about the events happened in the past, which were short lived and quickly finished. I have written = Present Perfect Tense -We use it to say that a finished action or event is connected

Could someone help me to understand difference of meaning between - "may be", "might be", "may have been", "might have been", "would", "could"," would be", "could be" Thanks!