He also says parents don't understand the extent of the problem.

He said parents did not understand the extent of the problem.

We're still trying to figure out the extent of the problem.

But then he didn't know the extent of the problem I'd just talked myself into.

The extent of the problem, however, has never been clear.

Many Americans might find it hard to understand the extent of the problem.

But the extent of the problem is difficult to measure.

So far, the true extent of the problem may be limited.

"The survey itself will tell us the extent of the problem."

"You don't see the extent of the problem until the leaves fall off."