现在完成时时态标记词
1)already, just, ever, never / yet, so far,up to now,before,recently,lately 2)for +一段时间,
since+过去的时间点或过去时从句
3)in the last/past ten years "在过去的十年中"等.
4)it’s the first time that….
英语十六时态表