At first, some students have difficulty understanding the difference between rules and norms.

"So it's safe to say you had difficulty understanding him?"

Am I the only one who has difficulty understanding her?

They often have difficulty understanding the consequences of their actions.

I have a bit of difficulty, you know, understanding exactly why.

If you have any difficulty understanding the situation, perhaps a second opinion would be of help.

He had no difficulty understanding her, because she used the language of home.

I am sure none of you will have difficulty understanding it.

An interesting article, however I had some difficulty understanding it.

Why is it that small children have such difficulty understanding the concept of time?