11.   Two or three of the salespeople knew me by sight.

12.   You need to let me know by Monday if you want to take part.

13.   He looked very different, but I knew him by his voice.

14.   We all knew by then that the affair was practically over.

15.   Many of us find it very difficult to state our needs.

16.   We expect people to know by telepathy what we are feeling.

17.   She seemed to know by instinct that something was wrong.

18.   He knew by instinct what not to say.

19.   I knew by hearsay that he was the editor of the American Mercury, but aside from that I knew nothing about him.

20.   You may not immediately know us by name, but you do know us.