【摘要】：She has gone to Beijing.她到北京去了。She has ever been to Beijing.她曾经到过北京。She has gone.她已经去了。The door has been closed.门被关上了。（动作）The door is closed.门是关着的。（状态）He has come.他已经回来了。The snow is melted.雪化了。He has been there once.他曾经到过那里一次。（曾经）He once lived in Geneva.他曾经一度住在日内瓦。She comes from Nanjing.她是南京人。You read very well.你朗读得很好。You have read very well.你朗读得很好。
She has gone to Beijing.她到北京去了。（不在这里）
She has ever been to Beijing.她曾经到过北京。（现已返回）
She has gone.她已经去了。（不是没去）
She is gone.她不在。/她缺席了。（句中的gone表示状态）
The door has been closed.门被关上了。（动作）
The door is closed.门是关着的。（状态）
He has come.他已经回来了。
He is come.他来了。（=He is present.）
The snow has melted.雪已经融化了。
The snow is melted.雪化了。（melted表示状态，意为“看不见雪了”）
He has been there once.他曾经到过那里一次。（曾经，一次）
We've all been young once.我们都有过年轻的时候。（曾经）
He once lived in Geneva.他曾经一度住在日内瓦。（从前一度）
She comes from Nanjing.她是南京人。
She has come from Nanjing.她从南京来。（不一定是南京人）
You read very well.你朗读得很好。（具有朗读的才能或刚才读得好）
You have read very well.你朗读得很好。（仅指刚完成的动作）
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