📌三大核心结构：
❶ have been to+地点：去过已归
例句：I've been to Tokyo.我去过东京（去过已经回来）
❷ have gone to+地点：去了未回
例句：She's gone to Shanghai.她去了上海（还没回来）
❸ have been in+地点：停留某地
例句：They've been in Paris for 3 months.他们在巴黎待了三个月
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