1、介词across作横过，穿过，跨越讲，例如a millions of schools across the world全世界范围内数以百万计的学校，across the years多年来，等等
2、介词across作在...对面，在...的另一边，或与...相交叉讲，例如across the street, the music from across the street, lay a stick across another one等等
3、介词across和有关动词连用，表示偶然碰到，例如come across, drop across, fall across sb. ran across等等
4、副词across表示过去，过来，从一边到另一边，例如be across at 8， bring sb. across, glance across at sb. , row across, 等等
5、副词across和有关动词搭配，表示使其理解或领会，例如 He put himself across to the voters as a suitable leader
6、在阅读的时候，我们要结合上下文，正确理解across的本义及其动词短语的引申用法，麻质跹礼例如put across本义为让...墩伛荨矧通过或穿过...，you can't put that across me，可理解为你骗不了我
