completely forgot
I completely forgot that we were not at home.
— Подводная лодка (1981)
I completely forgot about him.
Совсем забыл, босс сказал мне оставаться здесь.
I completely forgot—the boss told me to stay here.
— Двойная рокировка (2002)
I completely forgot about her.
Я совсем забыл о собаке, иначе бы сам пришёл за яйцами.
I completely forgot about the dog; otherwise, I would have come for the eggs myself.
— Забавные игры (1997)
I completely forgot about you.
Damn, I completely forgot!
Совсем забыл, что ты должна прийти.
I completely forgot that you were supposed to come.
— Ветер крепчает (2013)