The quality and the direction of the light have changed.

Their quality changed, but he could not explain to himself how, or in what way.

She was older now, and the quality of her delight had changed.

The quality of the light changed throughout the day and varied by season.

As they moved away from the shore, the quality of the sound changed.

The quality of the light had not changed since dawn.

She stopped speaking for a moment, and the quality of silence had changed yet again.

During this time, the quality of the food does not change, if it is kept under normal conditions.

However, the quality of these series have changed since they dropped the old names.

The quality of the light within the library had changed.