At first the work was difficult for him because of the shape of his hands.

This proved to be difficult, not least because of rivalry between the various agencies.

Your question is difficult because of all the parameters that are involved.

However, times were difficult because of wars which affected the district.

"It's very difficult now to do that, because of the increased security measures taken by the dealers."

Her four years at the helm have been difficult, particularly because of health problems along the way.

Its shore is difficult to access because of the thick vegetation growing along the river.

Trump contact is difficult there, perhaps because of the time differential.

It was difficult to say, because of the darkness and the screens.

This was very difficult, if not impossible, for him, because of flying times and meeting schedules.