第1个回答 2016-03-20
since+ 时间点, for+时间段, already, yet, ever, never, so far, until now, up to now, recently,t hese days/weeks/years,always, in the last/past( few years)
这些词出现时常用现在完成时。也不是特别绝对。
现在完成时用于
1 表示过去发生的某一动作对现在造成的结果或影响
2也可指过去开互触皋吠薤杜鸽森龚缉始延续到现在的动作或状态
She has worked at this school for 6 years. (过去到现在
3. 某人曾有过或到至今未有的经历
Have you ever been to the Summar Palace?本回答被提问者采纳