ʕ•ᴥ•ʔ Nu uitam! ʕ•ᴥ•ʔ
Present Perfect: Subject+have/has+past participle
Past Simple: Subject + Verb (Past tense)
a) He has written a book.
→Present Perfect
b) Albert has been in a wheelchair since he was eight years old.
→Present Perfect
c) First she bought the ticket, then she got on the train.
→Past Simple
d) In 2007 he set off for South America.
→Past Simple