6. Time past cannot be called back again.

　　光阴一去不复返。

　　7. All time is no time when it is past.

　　光阴一去不复返。

　　8. No one can call back yesterday;Yesterday will not be called again.

　　昨日不复来。

　　9. Tomorrow comes never. 小学生英语手抄报

　　切莫依赖明天。

　　10.One today is worth two tomorrows.

　　一个今天胜似两个明天。