高三专题 介词和连词【专题要点】介词和连词要点概览：1.on, at, in表示时间和方位的用法；2.in, after, later的用法辨析；3.through, over, across的区别；4.表示方式、手段或工具的介词by, in和on以及with, by和in的区别；5.except, except for, besides, but的用法区别；6.because of, owing to, duo to, thanks to的用法；7.连词and, but, while, yet, therefore等的用法；8.for, because, since的用法区别；9.并列连词and, neither-nor, both-and-, as well as, not only-but also等的用法及辨析；10.选择连词or, either-or, or else, otherwise等的用法；11.表示因果关系的连词because, since, as, for, so等的用法辨析；12.转折连词but, yet, while, wher
