如何区分连词和介词?答:3. 表示某一时刻或某一点时间用at,如小时、分钟等。at breakfast(supper, lunch),at six at noon (sunrise, sunset, midday, night, midnight, dawn) at the age of 15, at the time of war,但in time of danger/ trouble。注意:有些时间名词前不接介词。如: next day、last Sunday、that morning、...