pronoun
BAD : She hadn't seen somebody for over a week.
GOOD : She hadn't seen anybody for over a week.
BAD : Somehow he had to get on the train without someone seeing him.
GOOD : Somehow he had to get on the train without anyone seeing him.
pronoun
BAD : She hadn't seen somebody for over a week.
GOOD : She hadn't seen anybody for over a week.
BAD : Somehow he had to get on the train without someone seeing him.
GOOD : Somehow he had to get on the train without anyone seeing him.
Longman Common Errors English vocabulary. Английский словарь распространенных ошибок Longman. 2012