1704950267
Is han’t be able to come on January 1st．我1月1号不能来。
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1704950269
A reception was held on New Year’s Eve．新年前夕开了一个招待会。
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1704950271
On this occasion he said nothing．这一次他没讲话。
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1704950273
在……时（跟动名词或名词，表示前一动作一发生，后一动作立即发生）：
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On reaching the city, he called up Lester．到达城里时，他给莱斯特打了电话。
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1704950277
He started on seeing her．他看到她时一惊。
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1704950279
On his return from Europe, he set to work in earnest．在从欧洲回来时他认真干了起来。
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1704950281
The boys stood up on the entrance of the headmaster．校长进来时男孩子们都站了起来。
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1704950283
（表示原因）根据，由于，在……下：
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1704950285
He did it on the instructions of his superior．他是根据上级指示这样做的。
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1704950287
She read the book on the recommendation of a friend．由于一个朋友的推荐她看了这本书。
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1704950289
I came on your invitation．我是在你们的邀请下来的。
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1704950291
（表示目的）去（做某事）：
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1704950293
She had come on a visit to England．她来访问英国。
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1704950295
She had been away on a long trip．她离开去长途旅行了。
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1704950297
They had journeyed to Russia on a mission．他们到俄国去执行一项任务。
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1704950299
引起许多短语作状语：
1704950300
1704950301
That’s very satisfactory on the whole．总的说来这很令人满意。
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1704950303
Don’t give it up on any account．不管有什么理由都不要放弃。
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1704950305
The school bus arrived at school on schedule．校车按时来到学校。
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She looked at him now and then on the sly．她不时偷偷地瞧他。
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She always acts on impulse．她总是冲动行事。
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1704950311
He accepted the cup on behalf of the team．他代表球队接受了奖杯。
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1704950313
引起各种短语作表语：
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1704950315
I’ve always been on my guard since then．从那时起我一直很警惕。
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