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现在完成时： 1.概念：过去发生或已经完成的动作对现在造成的影响或结果，或从过去已经开始，持续到现在的动作或状态。 2.时间状语：recently, lately, since...for...,in the past few years, etc. 3.基本结构：have/has + done 4.否定形式：have/has + not +done. 5.一般疑问句：have或has。 6.例句：I've written an article. The countryside has changed a lot in the past few years. (责任编辑：admin) |