They have worked here since they left college.他们大学毕业以后就在这里工作。
2.表示“曾经到过某地（人已回来）”用“have/has been to”,表示“到某地去了（还未回
来）”用“have/has gone to”。
—Where is Li Hua?—李华在哪里？
－He has gone to the reading-room.—他去阅览室了。
—She knows a lot about Shanghai.—关于上海，她懂很多。
－She has been there.—她去过那里。
短暂动词（即瞬间动词），如：
join,lose,buy,borrow,leave,go,come,arrive,die,marry,finish,complete,begin,
start, break out等，在完成时态中，其肯定式不能和表示一段时间的状语连用。
要翻译“他已参军已经三年了”。不能说：He has joined the army for three years.而要用以
下三种方法：
①“ago法”：He joined the army three years ago.
②“延续法”：He has been in the army for three years.
③“since法”：It is/has been three years since he joined the army.
（八）过去完成时
表示在过去某一时间以前已经完成的动作。
He had shut the door before the dog came up.在那狗走过来之前，他已将门关上了。
Everything had been all right up till this morning.直到今天上午为止，一切都正常。
1.表示动作或状态从过去某个时刻开始一直延续到另一个过去时刻才完成，甚至还要继续
下去。
At the age of ten, he had learned 500 English words.十岁的时候，他已经学了500个英语单词
了。
He had been ill for a week when we learned about it.我们知道的时候，他已经病了一个星期
了。
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