They were seeing if he actually understood the language and was not just making up random comments.

Calhoun knew immediately that this was not some random comment.

What information is available has come from leaks and random comments by public officials.

He didn't strike M'k'n'zy as the type to make random comments for no reason.

"From time to time they will probably make some absurd random comments."

She realizes that his jests are not just random comments.

What could you really do, Clara, with the random comments of three bewildered kids?

Oh and has random comments by me when no-one is singig.

She is however, somewhat dense and oblivious to some things, to the point of making random comments.

Alex is known for his random comments and impressions.