across, over and through
Across and over can both be used to mean ‘on or to the other side of a line,
river, road, bridge etc’.
His village is just across/over the border.
See if you can jump across/over the stream.
We prefer over to say ‘on/to the other side of something high’.
Why are you climbing over the wall? (NOT … across the wall?)
We usually prefer across to say ‘on/to the other side of a flat area or surface‘.
He walked right across the desert.
It took them six hours to row across the lake.
Note that the adverb over has a wider meaning than the preposition over. We often use over (to) for short journeys.
I’m going over to John’s. Shall we drive over and see your mother?
The difference between across and through is like the difference between on and in. Through, unlike across, is used for a movement in a three-dimensional space, with things on all sides.
– We walked across the ice. (We were on the ice.)
I walked through the wood. (1was in the wood.)
– We drove across the desert.
We drove through several towns.