(1)表示经常性、习惯性的动作;

　　eg：I get up at 7 o’ clock in the morning.

　　I leave school for home at 6 every evening.

　　(2)客观真理，客观存在，科学事实;

　　eg：The teacher told us: the earth moves around the sun.

　　Shanghai lies in the east of China.