我去过北京,我去过北京三次
I have been to Beijing,I have been there three times.
我认识你爸爸十年了.
I've known your father for ten years.
我十年前认识的你爸爸.
I knew your father ten years ago.
我十年前见到你爸爸时他正在教英语课.
Your father was teaching English when I met him ten years ago.
小孩一小时前入睡的.Fell asleep one hour ago
The kid fell asleep one hour ago.
小孩正在睡觉.
The kid is sleeping.
他已经睡了一小时了.
He has been asleep for one hour.
我在上海生活了十年了.
I've lived in Shanghai for ten years.