摘要: 根据特定语境和时态标志考查现在完成时的影响性用法(1)― you him around the museum yet?― Yes. We had a great time there. A. Have; shown B. Do; show C. Had; shown D. Did; show[解析]A.根据问句中的yet可知.所谈论的事情发生在最近的过去.且问话者很关心这个过去发生的事情对现在的影响和结果.所以用现在完成时.注意:不要受答语中过去式谓语had的影响而误选C.(2)Professor James will give us a lecture on the Western culture, but when and where yet. A. hasn’t been decided B. haven’t decided C. isn’t being decided D. aren’t decided[解析]A.根据句意.此处应用被动语态.不用主动语态,再根据句末的yet可知.最好用现在完成时.故选A最佳.

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