Had anyone been following her, he must have lost the trail.

Both of us lost the trail, then found it again.

They had lost the trail, I was sure of that.

We cannot be certain that it has lost my trail.

He had not lost the trail; that could never happen.

He was angry with himself for having lost the trail.

They had lost the trail, but that was of no importance.

How far west will I have to go before the lawyers lose the trail and get left behind?

The very first day we lost their trail in some rocky country.

You left quickly and then I lost your trail altogether.