The guard on the wall walk outside had changed twice.

She stayed long enough to see the guard changed, and much more besides.

I knew, of course, that the guard had changed at Alhambra.

In the evening the guard changed and I called to these new ones, but they said nothing.

Why, he must have passed before the guard changed.

The guards had changed shifts, but looked at everyone just as seriously.

Yes, as I glanced at my watch, the guard would have changed.

A clatter at the door said her guards were changing.

I had a tense few minutes when the guard changed outside.

Still, much is different since the last time the guard changed.