Контрольная работа по "Английскому языку"

Задание №1.
Перепишите и письменно переведите следующие предложения, обращая внимание на перевод перфектного герундия на русский язык.
1) I was surprised at his having studied the US Constitutional Law.
2) Andrew remembers having been asked to tell Russian students about Britain.
3) My having know nothing about his article surprised him.