He was in no state to form an idea of what we were talking about.

"Never got close enough to him to form a good idea about that."

"Then at least I'd be able to form a better idea of what he's really like."

I began to form new ideas of the perfect man.

It is difficult to form an idea of the perfect change that had taken place.

They might help her to form an idea of what their owner was like.

We hope you have been able to form a rough idea.

Most Members were unable to form an idea of the situation using their own resources.

They form a general idea and fill in the details.

He did not go far up the river but formed an accurate idea as to its source and course.