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编辑推荐：2015成人英语三级考试复习重点汇总
方位介词across、through、over、past的用法辨析
介词across着重于“从一头或一边到另一头或另一边”，强调从表面穿过。
如：She went across the street to make some purchases.
A. 介词through着重于“穿越”，强调从一定的空间内穿过。
如：The sunlight was coming in through the window.
B. 介词over多表示从“上方越过”，如：He failed to go over the mountain; he had to go round it.
C. 介词past表示从“面前经过”，如：Someone has just gone past the window.
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