The preposition across shows movement or position from one side to the other.
- The child ran across the road. (From one side of the road to the other)
- There is a bridge across the river.
- Can you jump across the stream?
Across can also mean on/to the other side.
- The library is just across the road.
- I live across the street.
Across and Through
The difference between across and through is similar to the difference between on and in. Across is used for a movement in a two-dimensional space. Through is used for a movement in a three-dimensional space.
- We walked across the field. (We were on the field.)
- He drove through the tunnel. (He was in the tunnel.)
- We slowly walked through the wood. (We were in the wood.)
Search the Dictionary of Practical English Usage
As, since, because and for
A lot of, lots of, plenty of, a great deal of
Below and under
Above and over
Both and both of
As if and as though
Fairly, quite, pretty and rather
Finally, at last, in the end and at the end
No and none
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