he forgot
Он забыл надеть штаны, так торопился увидеть Ранчо.
He was in such a hurry to see the Ranch that he forgot to put on his pants.
— Три идиота (2009)
Она попросила его перезвонить ей позже, но он забыл.
She asked him to call her back later, but he forgot.
He forgot to call back.
He forgot his money.
He forgot to buy her a gift.