方位介词： over，above，on

① under 用于表示“在......之下”，处于正下方，其反义词是over

② below 用于表示“在......之下”， 不一定在该物的正下方， 其反义词是above

例子:

⑴ There is a book under the table.

⑵ He looked down at the hall below.

方位介词：under，below

① across 用于表示“穿过”，在某一物体的表面穿过

② through 用于表示“穿过”，在某一物体的中间穿过

③ along 用于表示“沿着”，用于狭长的东西

例子:

⑴ The dog ran across the grass.

⑵ They walked through the forest.

⑶ We walked along the river.

方位介词：across, through, along

① in front of 用于表示“在某人或某物的前面

② behind 用于表示“在某人或某物的后面

③ around 用于表示“在某人或某物的周围

例子:

⑴ There are some tall trees in front of the building.

⑵ There is a river behind the house.

⑶There are many trees around the village.

方位介词：in front of, behind, around

① in front of 用于表示“在某人或某物的前面”，在某个范围以外

② in the front of 用于表示“在......的前部”，在某个范围以内

例子:

⑴ There are some tall trees in front of the building.

⑵ The teacher is sitting in the front of the classroom.