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1.It's been six years since we last saw each other, you know.
2.And this is the first time I've visited your hometown.
3.You know, I've seen quite a lot of China and I've visited some beautiful cities, but this is one of the most attractive places I've been to.
4.They've put up a lot of highrise buildings recently.
5.Up to now, I've understood everything the teacher's said.
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1.由例句1、2、3、4、5可知，现在完成时的构成：has/have＋过去分词。
2.由例句1可知，现在完成时可与since引导的时间状语从句连用。
3.由例句4、5可知，现在完成时可与时间状语recently, up to now等连用。
4.由例句3可知，have/has been to表示“曾经去过”；have/has gone to 表示“已经去了某地，去而未归”。
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