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介词at，in，on都可用来表示时间，只是用法不同。现将这三个介词的用法归纳如下：
一、at的时间表达法
用于表示在三餐或中午、晚上。
1．What did your mother say at breakfast ／lunch ／supper time？
2．We heard a girl singing in the next room at noon ／night．
用于表示时间上的某一点或某一时刻。如：
3．What were you doing at this time yesterday？
4.We often start classes at eight o’clock in the morning．
用于表示节气、年龄。如：
5.I often receive presents at Spring Festival．
6.Jim began to play the piano at the age of seven．
二、in的时间表达法
用于表示非特指的早晨、上／下午、夜晚。
1．I often get up before 6 o’clock in the morning．
2．We like watching TV in the evening．
用于表示在一段时间内。如：
3.Mother will be back in a few days．
4.It would strike twelve in twenty minutes’ time.
用于表示月份、季节、年、世纪等。如：
5.Everything begins to grow in spring．
6.The Olympic Games will be held in Beijing in 2008．
三、on的时间表达法
用于表示在具体某天或某一特定日子的上午、下午或晚上。
1．I often do my homework on Saturday afternoon．
2.My grandfather died in the mountain on a cold winter afternoon．
用于表示节日的名词前。如：
3．Australians often go to church on Christmas Day．
4.Chinese visit their relatives and friends on New Year’s Day．
四、含有early morning，late afternoon之类的词语时，通常用in，不用on。
1.in the early morning of 21st，March；
2.in the late afternoon of 15th，September
五、由last，next，this，that，these，those等构成的表示时间的短语前面，通常不用介词。yesterday，today，tomorrow，tonight等词前面通常也不用介词。
1.I bought a Chinese-English dictionary this morning．
2．We traveled to Beijing last summer．
一、at的时间表达法
用于表示在三餐或中午、晚上。
1．What did your mother say at breakfast ／lunch ／supper time？
2．We heard a girl singing in the next room at noon ／night．
用于表示时间上的某一点或某一时刻。如：
3．What were you doing at this time yesterday？
4.We often start classes at eight o’clock in the morning．
用于表示节气、年龄。如：
5.I often receive presents at Spring Festival．
6.Jim began to play the piano at the age of seven．
二、in的时间表达法
用于表示非特指的早晨、上／下午、夜晚。
1．I often get up before 6 o’clock in the morning．
2．We like watching TV in the evening．
用于表示在一段时间内。如：
3.Mother will be back in a few days．
4.It would strike twelve in twenty minutes’ time.
用于表示月份、季节、年、世纪等。如：
5.Everything begins to grow in spring．
6.The Olympic Games will be held in Beijing in 2008．
三、on的时间表达法
用于表示在具体某天或某一特定日子的上午、下午或晚上。
1．I often do my homework on Saturday afternoon．
2.My grandfather died in the mountain on a cold winter afternoon．
用于表示节日的名词前。如：
3．Australians often go to church on Christmas Day．
4.Chinese visit their relatives and friends on New Year’s Day．
四、含有early morning，late afternoon之类的词语时，通常用in，不用on。
1.in the early morning of 21st，March；
2.in the late afternoon of 15th，September
五、由last，next，this，that，these，those等构成的表示时间的短语前面，通常不用介词。yesterday，today，tomorrow，tonight等词前面通常也不用介词。
1.I bought a Chinese-English dictionary this morning．
2．We traveled to Beijing last summer．