sentence: I haven't seen you for almost two months but , as you know , in November I had a unique opportunity to help at a concert that took place on an airport runway and it was a simply amazing experience !
modified: I haven't seen you for almost two months but , as you know , on November I had a one of a kind possibility to help at a concert that took place on airport runway and it was simply amazing experience !
transformation: PREP, OTHER, NOUN, DET, DET