This is, as I say, a matter which has given me much concern.

However, the Principal tells me your progress recently has been giving him concern.

"Less than a dozen would begin to give us concern," he said.

There is continuing evidence of efforts to traffic in nuclear material that give many officials deep concern.

"When we are talking about life and death, this gives us serious concern," he said.

He was wary of a trap, but saw nothing that gave him concern.

The cut was so steep, he added, that it gave him concern.

There are three matters that give a bit more concern.

These events have rightly given renewed concern to all of us.

The 14th tee-shot was the only one to give me concern from then on in.