[语法初识]
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原句感知
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自主探究
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①It's been six years since we last saw each other, you know.
②And this is first time I've visited your hometown.
③I've seen quite a lot of China and I've visited some beautiful cities.
④But this is one of the most attractive places I've been to.
⑤They've put up a lot of highrise buildings recently.
⑥My wife's just bought a beautiful dress from one of the shops there.
⑦In the past few years, a lot of people have flooded into big cities.
⑧The boy has been away from home for two years.
⑨He has gone to the Great Wall.
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1.现在完成时的构成是：have/has＋过去分词。
2．从①⑤⑥⑦⑧句中可看出与现在完成时连用的时间状语常见的有：in_the_past_few_years;_recently;_for_two_years;_since引导的从句；just。
3．由④⑨句可知：have/has_been_to表示“曾经去过(某地)”；have/has_gone_to表示“已经去了(某地)”。
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[语法剖析]
基本形式：have/has＋动词的过去分词
否定形式：have/has＋not＋动词的过去分词
被动形式：have/has＋been＋动词的过去分词
