He has worked in that hospital for 8 years.(他已经在那家医院里工作了8年。表示他从过去开始工作，一直工作到现在，现在仍在那家医院工作。)

2) 因为含有for加一段时间或since加一个时间点这样的时间状语的完成时，有动态和延续性的特点，所以不能使用终端动词或瞬间动词。

例：My sister has been married for 5 years.(过去分词做表语表示状态，可以延续)

My sister has married. Don't disturb her.(终端动词)

3) 在"this is the first/ second/ third…… time that……"句型里要求用完成时。

例： This is the second time that the products of our company have been shown in the International Exhibition. (这是我公司产品第二次参加国际展览会。)

4) 句型"It is/ has been……since"所使用的两种时态都正确。

例：It is/ has been 10 years since I last saw him.(从我上次见到他以来已经10年了。)

5) 在"no sooner than"、"hardly/ scarcely ……when"、"before"、"prior to"等句型中，主句要求完成时。

例：I haven't met that professor prior to today.(以前我从未见过那位教授。)