The thought that there might have been will haunt me 'til the day I die.

The thought haunted him and he returned to his studies.

The thought of not being able to provide for a family still haunts him.

That last thought haunted me all through the night.

However, the thought of the lucrative trade with the Indies haunted him.

These thoughts haunt him as he runs through a park eventually stumbling upon a couple making out.

And a thought that will, I hope, haunt him for the rest of his life.

Yes, he could see it: the thought had haunted her as well.

The mistake was not his, but the thought of the dead schoolchildren haunted him until the end.

And had the thought of giving up the only child she might ever have haunted her?