through

across, along, over, through

这些前置词均有“横过、穿过”之意。
across: 指“从……的一边到另一边”，强调横过，多与动态动词连用。
along: 指沿着一条直线在水平方向上运动。一般表动态，有时也与静态动词连用。
over: 常和动态动词连用，指“从……上面越过”或“横越”；表静态时，指“在彼处”。
through: 侧重从一端穿到另一端。

across, through, cross

都可表示“横过”或“穿过”
across: 主要表示从某物的表面“横过”，涉及“面”的概念。

• my house is across the harbour，in the vicinity of the kowloon park．
  我的家在海港的对岸，九龙公园附近。
• they live across the central plaza.
  他们住在中央广场的对面。
• everyone shouts "kill it" when a rat is seen to run across the street．
  老鼠过街，人人喊打。

through: 则表示从某个空间“穿过”，涉及“体”的概念。
cross: across和cross在拼写上仅差一字之微，故很易混淆。它们的区别在于词性和使用场合有所不同。across是介词；cross是动词。

• he has crossed the border into another territory．
  他已越过边界进入别国的领土。
• many steel arch bridges cross the mississippi in its lower reaches．
  在密西西比河的下游许多拱形铁桥横跨河面。
• they have crossed over to japan．
  他们已东渡去日本了。

形容词 through:

1. having finished or arrived at completion
   同义词：done, through with
2. (of a route or journey etc.) continuing without requiring stops or changes

副词 through:

1. from beginning to end
2. over the whole distance
3. to completion
4. in diameter
5. throughout the entire extent
   同义词：through and through

1. Don't tell me how it ends I haven't read all the way through yet.
   先别告诉我书的结尾－－我还没看完呢。
2. Ask to be put through to me personally.
   你告诉接电话的人，要求和我本人通电话
3. How soon will you be through?
   您要用多长时间打完电话？
4. He walked home in the rain and was wet through.
   他冒雨步行回家，淋得浑身湿透。
5. The river flows through the city from east to west.
   这条河从东到西贯穿这座城市。