on,at,in,分别在什么时候使用？
1、in 用在某年某月某季度等。如 in 1999
2、at 用在时刻前。如 at six
3、on 用于具体某一天（早上、下午、晚上）前，如：on Sunday , on Monday morning.
拓展资料
in
1. No matter where you go in life or how old you get, there's always something new to learn about. After all, life is full of surprises.
不管你生活在哪里，你有多少岁，总有新东西要学习，毕竟，生活总是充满惊喜。
2. For what do we live, but to make sport for our neighbours, and laugh at them in our turn?
我们活着是为了什么？不就是给邻居当笑柄，再反过来笑他们。
3. If you're lonely when you're alone, you're in bad company.--Jean Paul Sartre
如果你独处时感到寂寞，说明没有把自己陪好。
4. The turning point in the process of growing up is when you discover the core of strength within you that survives all hurt.
当你从内心深处找到一种可以忍受一切痛苦的坚强力量时，你的成长历程就会出现飞跃。
5. They have maintained their optimism in the face of desolating subjugation.
面对遭征服的悲惨命运，他们保持了乐观的态度。
6. The military regime in power was unpopular and repressive.
当权的军政府压制人民，不得人心。
7. The council recently drew fire for its intervention in the dispute.
委员会最近因为介入该起争端而遭到批评。
8. In her spare time she read books on cooking.
业余时间里她看一些烹饪方面的书籍。
9. Malvolio becomes, in default of competition, the play's moral centre.
因为没有与其竞争者，马伏里奥自然成了该剧的道德核心。
at
1. The world breaks everyone, and afterward, many are stronger at the broken places.
生活总是让我们遍体鳞伤，但到后来，那些受伤的地方会变得更坚强。
2. For what do we live, but to make sport for our neighbours, and laugh at them in our turn?
我们活着是为了什么？不就是给邻居当笑柄，再反过来笑他们。
3. You have to do everything you can. You have to work your hardest. And if you do, if you stay positive, then you have a shot at a silver lining.
你必须全力以赴，最大限度地去努力。如果你这么做，并且保持乐观，你就会看见乌云背后的幸福线。
4. I thought I'd enrol you with an art group at the school.
我想我会吸收你参加学校的一个艺术团。
5. The unevenly matched armies met at Guilford on 15 March 1781.
1781年3月15日，力量悬殊的两支队伍在吉尔福德狭路相逢。
6. He finished his conversation and stood up, looking straight at me.
他说完话站起来，直视着我。
7. Well, at any rate, let me thank you for all you did.
好吧，不管怎样，还是要感谢你所做的一切。
8. He shouted at his brother, his neck veins bulging.
他朝他的兄弟吼叫，脖子上青筋暴突。
in
1. No matter where you go in life or how old you get, there's always something new to learn about. After all, life is full of surprises.
不管你生活在哪里，你有多少岁，总有新东西要学习，毕竟，生活总是充满惊喜。
2. For what do we live, but to make sport for our neighbours, and laugh at them in our turn?
我们活着是为了什么？不就是给邻居当笑柄，再反过来笑他们。
3. If you're lonely when you're alone, you're in bad company.--Jean Paul Sartre
如果你独处时感到寂寞，说明没有把自己陪好。
4. The turning point in the process of growing up is when you discover the core of strength within you that survives all hurt.
当你从内心深处找到一种可以忍受一切痛苦的坚强力量时，你的成长历程就会出现飞跃。
5. They have maintained their optimism in the face of desolating subjugation.
面对遭征服的悲惨命运，他们保持了乐观的态度。
6. The military regime in power was unpopular and repressive.
当权的军政府压制人民，不得人心。
7. The council recently drew fire for its intervention in the dispute.
委员会最近因为介入该起争端而遭到批评。
