Present perfect - Wikipedia
https://en.wikipedia.org/wiki/Present_perfectThe present perfect is a grammatical combination of the present tense and perfect aspect that is used to express a past event that has present consequences. The term is used particularly in the context of English grammar to refer to forms like "I have finished". The forms are present because they use the present tense of the auxiliary verb have, and perfect because they use that …
Present Perfect Continuous Tense | Grammarly
www.grammarly.com › blog › present-perfectGrammar. The present perfect continuous tense (also known as the present perfect progressive tense) shows that something started in the past and is continuing at the present time. The present perfect continuous is formed using the construction has/have been + the present participle (root + -ing). I have been reading War and Peace for a month now.