1.
and it is common practice for people to go back to school from time to time,
人们时常返回学校学习，这已成为常事，
2.
My child often grinds his teeth together when he is asleep
我的孩子睡着时常常磨牙。
3.
He was troubled by false memories occasionally.
他有时常常会有这种假记忆。
4.
Regular inspection of areas not normally manned24 hours a day.
常规检视，并非一天24小时常有人看管。
5.
The wind often dies down at sunset
风常常在日落时停止。
6.
When the waves become heavy, they often dash over the sea wall.
浪大时，常常冲过防波堤。
7.
While reading, he fluffed frequently.
他读的时候常常读错。
8.
When I was a child, I used to go to the river and bathe in the evening.
小时候，我常常在傍晚时去河里游泳。
9.
The Victorian Age is often boasted of as an age of progress.
维多利亚时代常常被夸耀为进步时代。
10.
put the clock/clocks forward/back;(in countries which have official summer time)change the time,usu by one hour,at the beginning/end of summer
（夏时制）将时钟拨快[拨回]（通常为一小时）
11.
Thank you so much [very, very much] for sparing your valuable time.
费你这么多宝贵时间，非常[非常非常]感谢。
12.
" She would just sit for hours with her head hung low, looking sad."
她常常低着头孤坐几个小时，看上去非常痛苦。”
13.
Many young people were so interested in the football game that they lost sight of time.
许多青年人对足球赛非常感兴趣，常常忘了时间。
14.
She often puts in twelve hours' work a day.
她常常一天工作十二小时.
15.
It is often cold in November and it rains sometimes.
到11月天气常常是冷的，而且有时下雨。
16.
It often causes a lot of inconvenience when buses come late.
公共汽车晚点时,常常引起许多不便。
17.
Thank you very, very much for sparing your valuable time.
耽搁了你宝贵的时间，非常非常感谢。
18.
When Herbert was young, he often made a face at class.
郝伯特小的时候，他常常上课做鬼脸。