1、现在完成时,实例如下:
In the last few years, China has made great achievements in environmental protection. 在最近这几年(不是过去)
This is a place you have been to before? 这个地方你已经去过了吗?(有可能是10年前去过,也有可能是1小时前去过)
I have worked here since June. 6月份之前没在这儿工作,之后发生转变,并且这个转变一直持续到现在。
He has been ill for 2 days.
How long have you known Tara?
Where have I seen you before? 之前在哪儿见过你
I was looking for you, where have you been? 从最近一次见到你之后,截止到现在,这段时间你去哪儿了?
2、有关于英语时态的内容,可参考《英语思维EME》。