摘要：They have left London for Moscow. 他们已经离开伦敦去了莫斯科。The old scientist has died because of his serious illness.那位科学家因为严重的疾病已经去世。
现在完成时态有两种情况，那就是延续性动词和短暂性动词。have been to 属于短暂性动词。
一，延续性动词可以接状语for,since等时间状语
1. They have lived here for ten years.他们在这里住了10年了。
2. I have been in Beijing since 1992. 我从1992 年开始一直在北京。
3. He's had a cold since two days ago.他已经感冒两天了。
二，短暂性动词不能接for,since等时间状语。
1. I have just come back to Kunming from Hunan. 我刚刚从湖南回到昆明。
2. She has been to France twice.她去过法国两次。
3. I have been to your hometown.我去过你们老家。
4. My father has gone to Shanghai.我父亲到上海去了。
They have left London for Moscow. 他们已经离开伦敦去了莫斯科。The old scientist has died because of his serious illness.那位科学家因为严重的疾病已经去世。各位同学，用手机学习英语的时候，尤其是苹果手机，电量往往不够，需要及时充电，为了不影响大家学习，今天推荐几款充电头和充电线，都是大促销。
来源：郑老师KMYYZY