You weren't very careful about your door the other night.

One has to be careful about the use of language.

But you just do want to be careful about this.

All these years later, she was very careful about physical space.

"You have to be very careful about the research, which does not show cause and effect," she said.

Can we also be careful about the use of words?

You want to be careful about that sort of thing.

Of that he was certain because he'd decided from the beginning to be careful about it.

The men will have to be careful about it though.

I decided to be more careful about my future behavior.