■on schedule 按照预定时间，及时，准时
The train arrived on schedule. 火车按时到达。
The alarm woke him on schedule. 闹钟准时把他闹醒。
■on shore 在岸上，在陆上
Passengers can speak to their friends on shore through wireless telephone. 乘客可以通过无线电话和岸上的朋友讲话。
When the ship arrived at the port, some sailors went on shore. 船到港口后，有些水手上岸去了。
■on show 在展出；在陈列
Scores of imported cars are on show here. 几十辆进口车正在这里展出。
The collection is on show at the
■on strike 在罢工（罢课、罢市）
The students are out on strike. 学生举行罢课。
The workers have been on strike for two weeks now. 工人已经罢工两星期。
■on time 准时
The trains run on time. 火车很准时。
We have to arrive on time at the doctor’s office. 我们得准时到达医生的办公室。
■on tiptoe 踮着脚；盼望
They stood on tiptoe to get a better look at the parade. 他们踮起脚以便把游行场面看得更清楚些。
The children were on tiptoe for vacation to begin. 孩子们急切地盼望假期开始。
【注】其中的tiptoe有时可用复数，且此时可以有物主代词修饰。如：
We crept around on (our) tiptoes so as not to disturb him. 为了不打扰他，我们蹑手蹑脚地走过去。
■on top 在上边；处于优势
The green book is at the bottom of the pile and the red one is on top. 绿皮的书在那一摞的底下，红皮的在上边。
Lendl was on top throughout the match. 伦德尔在比赛中始终占优势。
■on trial 在试用；在受审
The clerk was employed on trial. 那个职员是试用的。
Take the machine on trial for a week. 把这机器试验一星期。
He was on trial for murder. 他因谋杀罪而受审。
■on vacation 在休假
She plans to go on vacation for most of August. 她打算利用8月的大部分时间度假。
They have gone to
■on view 供人观看；陈列着
The exhibition is on view until September. 展览将办到9月。
The latest summer fashions are now on view in the big shops. 最新的夏装款式目前正在各大商店中展出。