through
1.through用作“完了的”解和through with用作“关于…完了的”解都是美国用法。例如：
- Are you through?
- Are you through with that job?
- I am nearly through with the book.
- I am anxious to get through with the examination.
get through with the examination是美国英语，作“考试完毕”解，get through the examination（没有with）英美通用，作“考试及格”解。
2.I am through with asking questions（我已经把要问的问题问完了）和I am through with smoking（我已经戒烟了）里的through是形容词。第一句里的with有时省去，with省去了through仍旧是形容词，asking却成了现在分词.
3.He was on tour throughout the country (from) April through July of this year里的 (from) April through July作“从4月一直到7月底”解，The book gives the titles of all English dictionaries published through 31 December, 1958里的through 31 December, 1958作“直到1958年12月31日（也包括那全天）”解。这里的through是近几年来才有的美国用法。不一定指时间，如也可以说from astronomy through zoology（从天文学直到动物学的种种科学）。
