When you have descended, lock the door at the top behind you; and when you reach the foot of the staircase, keep that door open.

I will have brought the old gentleman by that time, and you will let me in.

I shall go out by the great gate." "Why not go with me ?" inquired Hedwig.
"Because, your excellency, one person is less likely to be seen than two.

Your excellency will let me pass you.

I will mount the staircase, unlock the upper door, and change the key to the other side.