※ 引述《Chengheong (Hololang)》之銘言：
: 1. I have not heard from John since I lived in Taipei.
: 2. I have not heard from John since I have lived in Taipei.
: 3. I have not heard from John since I went to live in Taipei.
: The time span involed in the above sentences is the same.
: But sentence #1 means that I no longer live in Taipei "now."
: #2 means that I still live in Taipei.
No.3 is slightly odd. Are we to assume you're now living in Taipei? If
so, it should read: I have not heard from John since I came to live in Taipei.
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