gone，就是去了还没回来呢
been，曾经去过，现在已经回来了
my son has gone to NY. 我儿子去纽约了。（现在人还在纽约，没回来呢）
my son has been to NY. 我儿子去过纽约。（曾经去过纽约，现在人回来了）
have gone to 去了某地
---Where is Tom? I can't find him.
---He has gone to Beijing.
have been to 去过某地
I have been to Paris three times. 我去过巴黎3次。
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