oninat这三个介词后面跟时间时，有什么区别

oninat这三个介词后面跟时间时，有什么区别

1、时间介词in,on,at
at<天(eg.noon,dawn,night,one’clock)
on=天(Monday,30thJune,NewYear’sDay,Mother’sDay）
in>天(2008,summer,April,还有早午晚)
注意：
1)早午晚前后如有修饰语则用“on”
OnMondaymorning
Onasunnyafternoon
OnthemorningofMay23rd
Onadarknight
2)on,in,at不用于下列时间之前：this,that,last,next,every,each,today,yesterday,tomorrow,tonight
3)in+一段时间可以表“…之后”
Eg:Hurry!Theschoolbuswillleaveinfiveminutes
Iwillseemygrandparentsinafewdays.

2、方位介词：
1）at和in
in大地点≥town
at小地点eg.:intownatbusstation
inBeijingatschool
inUSA
2）on表示在物体表面上eg:onthetable,onthewall
注意：1)onthetree长在树上Thereisanappleonthetree.
inthetree呆在树上Thereisabirdinthetree.
2）onthewall挂在墙上Thereisapictureonthewall.
inthewall嵌在强中Thereisawindowinthewall.