语法讲解：过去完成时
过去完成时的形式：had + 过去分词
表示过去某个时间以前已经完成的动作或存在的状态。一般总结为：过去的过去发生到过去结束。经常与过去时间状语连用。
By the end of last month I had worked in New Oriental School for six years.
到上个月底我已经在新东方学校工作六年了。
He replied that his sister had caught cold for two days.他回答说，他姐姐感冒已经两天了。
过去完成时在时间状语从句中的应用：
1）时间状语从句
after / as soon as +过去完成时，主句为一般过去时
After the class had begun, the little boy arrived at the classroom.
开始上课以后，这个小男孩才到教室。
As soon as I had seen him, he said goodbye to me and went away.
我一看见他，他就向我说再见然后走开了。
2）时间状语从句
before / until +一般过去时，主句为过去完成时
He had called me before he came to see me.他来看我之前给我打过电话。
I had waited at the bus station for an hour until my girlfriend came.
在我女朋友来之前，我已经在车站等了她一个小时了。
3）时间状语从句
no sooner / hardly + 过去完成时，主句为than/when+一般过去时
I had do sooner gone out than it began to rain.我刚走到外面就开始下雨了。
1.As I soon learnt, he was English himself.
我很快了解到，他自己就是个英国人！
知识点1：as引导从句+主句的结构：
As we know, he is an English teacher.
正如我们所知，他是一个英语老师。
As he told, all students went out.
就像他说的，所有的学生都出去了。
As the teacher pointed out, one is never too old to learn.
就像老师指出的，一个人永远应该是活到老学到老。
知识点2：himself为反身代词，在书面表达中经常出现在句尾表示强调。
2.On the way, a young man waved to me.
途中，一个年轻人向我招手。
知识点1：on the way 途中，在路上
知识点2：wave to sb. 向某人招手,可用于下列四种情况：1）问候；2）再见；3）寻求帮助；4）发出信号
