She went over it with him several times, though the boy understood well enough even at first.

The boy did not understand, the logic was beyond him.

She wasn't sure the boy would even understand what was happening to them.

And how much would a boy of his age understand?

But the little boy in him could understand the look on his cousin's face.

He said the boy did not really understand the meaning of death.

He had been concerned that the boy might not understand.

He spoke for several minutes, words that the boy couldn't understand but would always remember.

For a moment the boy didn't understand what she meant.

The poor old boy hadn't understood a word of what was going on.