用在固定短语中。

①与时间、地点有关的

all the time一直; 始终 all the year around一年到头

at the age of在多少岁时 at the same time同时

at the beginning of开始 at the end of在……末

by the end of在……结束前 in the end最后

in the beginning开始 in the daytime白天

in the afternoon/evening/morning下午(晚上、早晨)

the day before yesterday前天 the day after tomorrow后天

the other day前些日子 at the bottom of在……底部

at the edge of在……边缘 at the foot of在……脚下

at/in/on the corner of在角上 by the side of在……旁边

in the direction of向……方向 in the distance远处

in the middle of中间 in the sky空中

in/on the street在大街上 in/on/to the east of在……东面

on the left/right在……右边 on the ground在地上

on the way to在去……路上 on the other side of在对面

⑵)其他较固定的搭配：