职称英语卫生类重点词汇介绍
neither ...nor意为“既不……也不”，表示选择关系，位于句首时常用倒装结构。
1>. Neither does he like the job nor can he do it well.
2>. Neither did he go to attend the meeting nor did he come to the office.
1. both…and: 两者都。。。表示并列关系
Both Tom and Peter are good at playing football.
2. while: 而。。。表示转折关系。
He is reading a book while his wife is watching TV.
B. 复合句：(complex sentence)
复合句是由主句+从句构成，它是英语学习中比较复杂的句子结构。一般来说，英语中一个句子只能有一个谓语，如果出现两个谓语，那么其中一个谓语只能是以从句的形式或并列句或非谓语动词的`形式出现。所谓从句是指从属于主句的句子，由从属连词连接。从句的种类有很多，但根据其性质和作用可以分为：名词性从句，形容词性从句(即定语从句)，副词性从句(即状语从句)三大类。
a. 定语从句(Attributive Clause)这是出现在阅读题型中最多的从句!重要!
定语从句：在句中做定语，修饰一个名词或代词。
先行词：被定语从句修饰的名词,词组或代词。
关系词：引导定语从句的词;一般紧跟在先行词后引出定语从句。分为关系代词和关系副词。
关系代词有：who, whom, whose, that, which等。
关系副词有：when, where, why等。
关系词常有3个作用：1，引导定语从句。2，代替先行词。3，在定语从句中担当一个成分。
例如:
Once upon a time, there was a king (who had a small kingdom).
先行词 关系词
For one thing, the tigers ( that were kept in the zoo) were often used in court.
先行词 关系词
There came out a young lady ( whose hair was golden).
先行词 关系词
They would meet on the night ( when there was a full moon in the sky).
关系代词引导的定语从句
关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
(1) A teacher is a person who passes knowledge to the student.
(2) The book that is on the desk was written by Yao Ming.
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