21.   Soon, they know them by heart.

22.   We know by now that whatever he touches will break, fall, or explode.

23.   Gabriel looked for his parents -- even though he knew by the local accents that he was far, far away from his own countryside.

24.   We are let know by it that she is a person of Taste...

25.   I do understand the expression, to know by sight.

26.   You know just by looking at it,

27.   As others in the class were quick to respond, the only way by which one knows that a country is unique is by comparing it with others.

28.   Once they talked of it in the village shop, the whole village would know by nightfall.

29.   By leaving they know they have renounced the country where they were born, grew up and went to school.

30.   And when I got through I knew immediately by the tone of her voice that she was, there was something wrong.