1 I puzzled over the problem for ages before the light suddenly dawned.

2 Following an ancient rhythm people are wending their way home before the light fails.

3 Before the light changed half a dozen times she disposed of the entire batch.

4 Though he heard the door opening almost at once, it was some time before the light went on.

5 Before the lights went down I saw that some one below in the stalls was trying to catch my attention.

6 He had time to finish these letters before the lights were put out.

7 I wasn't through three sentences before the lights came up again.

8 That girl I was dancing with before keeps following me around and I'm really not into her. Quick,[] let's leave before the lights come on.

9 This required that to avoid embarrassment one came to just before the lights went on after the final curtain.

10 To see if the treatment actually worked, two groups of mice, one with sight and one blind, were placed in dark cages for half an hour before the lights were turned on.

11 It was always touch and go whether we would get across the road before the lights changed.