21.   After a beat, they realize the mistake.

22.   By the time he realized his mistake it was too late.

23.   By the time he realized his mistake, it was too late.

24.   By the time she realizes her mistake, Alexander has died in Africa.

25.   By the time the publisher realized the mistake, the deadline for submissions had passed.

26.   Eventually, coaches would let the little guy throw and then realize their mistake.

27.   He spent a year in Libya before the agency realized its mistake and agreed to resettle him and rescue his family from their home in downtown Baghdad.

28.   Heintze said the officer involved had realized his mistake after a couple of minutes and had apologized.

29.   I was halfway across the street before I realized my mistake.

30.   If the writer had checked the almanac, he would have quickly realized the mistake.