The Shadow moved out into darkness and used his special key to lock the door behind him.

The Shadow had used his present process in the past.

The Shadow used the tower to reach the third floor.

The Shadow could have used a rifle now, but he had no time to find one and bring it along.

The Shadow had used his cab on many occasions of this sort.

The Shadow could use that same minute to reach the next window along the wall.

The Shadow would use it for the remainder of his journey.

The Shadow had used the forces of the law to make a counterthrust.

The Shadow was using the hidden route to the second floor.

The Shadow was using his favorite method for the climb.