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Step 3 : The second using of the Present Perfect tense
(1). Special time adverbial(特殊的时间状语)：for + period of time(时间段)，since + Point of time(时间点)
(2). Transient verb and Continuous verb(短暂性动词和延续性动词)
Step 4 ：What’s the difference between have been to and have gone to ?
Step5 : The difference between the Present Perfect Tense and The Present Past Tense
Step6 : The end .