Both ...... brothers have fallen victim to conmen.

Both ...... sisters know the ropes around here.

Both ...... CEOs have gone away for the day.

Both ...... children are doing their homework right now.

Both ...... teachers are discussing the students' grades.

Both ...... mechanics have quit their jobs.

Both ...... books have red covers.

Both ...... desks are mine only.

All ...... six staff have fallen sick with the flu recently.

All ...... students have studied hard for the final exam.

All ...... computers in our office have stopped working.

All ...... red pens are missing.

All ...... alarm clocks have already been sold.

All ...... answers were correct.

All ...... streets are swept every day.