介词1.in; on; at用在时间词前，表“在” 1)at + 具体时刻 2)on + 具体某天（具体某天的上、下午等；星期词；以及上、下午词前有修饰词时） 3)in + 年、月、季节及一天中的某部分但注意：at night= in the night at noon at this / that time at Christmaseg. 1._ the morning 2._ Monday morning3. _ a rainy evening 4. _3:50 5._ 20026._ the morning of April 10 7._ spring8._ night 9._ this time 10. _ March另外注意：在时间词（morning , afternoon , evening ; Sunday）前有last, next , this , that时，不再用介词. tomorrow, tonight前也不用介词。eg. I will go(A) to the
