Putting a child to bed is sometimes difficult at night.

It had been difficult to keep up with the old man or his daughter at first.

But then any kind of thought was difficult at the moment.

The two 688s could talk to and protect each other, but that would also be difficult at best.

It had been difficult at first and sometimes still was.

For a human it is not difficult at all, with training, of course.

But difficult at times to remember why I ever made such a plan, he wrote.

It was difficult at times like these being a woman.

Such subjects might be too difficult for him at an earlier age.

But for right now he had a mission that would be difficult at best.