2016-2017学年 外研版 必修5 Module5 The great sports personality Grammar 课件 (3)
2016-2017学年 外研版 必修5 Module5 The great sports personality   Grammar 课件 (3)第3页

1) I was walking down the street _______I saw some policemen. 2) You have enough food every day, _______many other people are starving. 3) ______time goes on, you will understand more about this world.

when

while

As

Note the following three sentences.